diff --git a/layout/generic/RubyUtils.cpp b/layout/generic/RubyUtils.cpp
index 74a0b126b6a..e99e79f01d8 100644
--- a/layout/generic/RubyUtils.cpp
+++ b/layout/generic/RubyUtils.cpp
@@ -9,6 +9,7 @@
 #include "nsRubyBaseFrame.h"
 #include "nsRubyTextFrame.h"
 #include "nsRubyBaseContainerFrame.h"
+#include "nsRubyTextContainerFrame.h"
 
 using namespace mozilla;
 
@@ -46,20 +47,13 @@ RubyUtils::GetReservedISize(nsIFrame* aFrame)
   return value.mCoord;
 }
 
-RubyTextContainerIterator::RubyTextContainerIterator(
+AutoRubyTextContainerArray::AutoRubyTextContainerArray(
   nsRubyBaseContainerFrame* aBaseContainer)
 {
-  mFrame = aBaseContainer;
-  Next();
-}
-
-void
-RubyTextContainerIterator::Next()
-{
-  MOZ_ASSERT(mFrame, "Should have checked AtEnd()");
-  mFrame = mFrame->GetNextSibling();
-  if (mFrame && mFrame->GetType() != nsGkAtoms::rubyTextContainerFrame) {
-    mFrame = nullptr;
+  for (nsIFrame* frame = aBaseContainer->GetNextSibling();
+       frame && frame->GetType() == nsGkAtoms::rubyTextContainerFrame;
+       frame = frame->GetNextSibling()) {
+    AppendElement(static_cast<nsRubyTextContainerFrame*>(frame));
   }
 }
 
@@ -84,7 +78,7 @@ RubySegmentEnumerator::Next()
 
 RubyColumnEnumerator::RubyColumnEnumerator(
   nsRubyBaseContainerFrame* aBaseContainer,
-  const nsTArray<nsRubyTextContainerFrame*>& aTextContainers)
+  const AutoRubyTextContainerArray& aTextContainers)
   : mAtIntraLevelWhitespace(false)
 {
   const uint32_t rtcCount = aTextContainers.Length();
diff --git a/layout/generic/RubyUtils.h b/layout/generic/RubyUtils.h
index d4ec33e2b18..26fbf8ea2fb 100644
--- a/layout/generic/RubyUtils.h
+++ b/layout/generic/RubyUtils.h
@@ -9,7 +9,6 @@
 
 #include "nsTArray.h"
 #include "nsGkAtoms.h"
-#include "nsRubyTextContainerFrame.h"
 
 #define RTC_ARRAY_SIZE 1
 
@@ -18,6 +17,7 @@ class nsRubyBaseFrame;
 class nsRubyTextFrame;
 class nsRubyContentFrame;
 class nsRubyBaseContainerFrame;
+class nsRubyTextContainerFrame;
 
 namespace mozilla {
 
@@ -68,23 +68,14 @@ public:
 };
 
 /**
- * This class iterates all ruby text containers paired with
- * the given ruby base container.
+ * This array stores all ruby text containers of the ruby segment
+ * of the given ruby base container.
  */
-class MOZ_STACK_CLASS RubyTextContainerIterator
+class MOZ_STACK_CLASS AutoRubyTextContainerArray final
+  : public nsAutoTArray<nsRubyTextContainerFrame*, RTC_ARRAY_SIZE>
 {
 public:
-  explicit RubyTextContainerIterator(nsRubyBaseContainerFrame* aBaseContainer);
-
-  void Next();
-  bool AtEnd() const { return !mFrame; }
-  nsRubyTextContainerFrame* GetTextContainer() const
-  {
-    return static_cast<nsRubyTextContainerFrame*>(mFrame);
-  }
-
-private:
-  nsIFrame* mFrame;
+  explicit AutoRubyTextContainerArray(nsRubyBaseContainerFrame* aBaseContainer);
 };
 
 /**
@@ -127,7 +118,7 @@ class MOZ_STACK_CLASS RubyColumnEnumerator
 {
 public:
   RubyColumnEnumerator(nsRubyBaseContainerFrame* aRBCFrame,
-                       const nsTArray<nsRubyTextContainerFrame*>& aRTCFrames);
+                       const AutoRubyTextContainerArray& aRTCFrames);
 
   void Next();
   bool AtEnd() const;
diff --git a/layout/generic/nsRubyBaseContainerFrame.cpp b/layout/generic/nsRubyBaseContainerFrame.cpp
index 572c85a7890..1dfad7c0545 100644
--- a/layout/generic/nsRubyBaseContainerFrame.cpp
+++ b/layout/generic/nsRubyBaseContainerFrame.cpp
@@ -153,8 +153,7 @@ CalculateColumnPrefISize(nsRenderingContext* aRenderingContext,
 nsRubyBaseContainerFrame::AddInlineMinISize(
   nsRenderingContext *aRenderingContext, nsIFrame::InlineMinISizeData *aData)
 {
-  AutoTextContainerArray textContainers;
-  GetTextContainers(textContainers);
+  AutoRubyTextContainerArray textContainers(this);
 
   for (uint32_t i = 0, iend = textContainers.Length(); i < iend; i++) {
     if (textContainers[i]->IsSpanContainer()) {
@@ -202,8 +201,7 @@ nsRubyBaseContainerFrame::AddInlineMinISize(
 nsRubyBaseContainerFrame::AddInlinePrefISize(
   nsRenderingContext *aRenderingContext, nsIFrame::InlinePrefISizeData *aData)
 {
-  AutoTextContainerArray textContainers;
-  GetTextContainers(textContainers);
+  AutoRubyTextContainerArray textContainers(this);
 
   nscoord sum = 0;
   for (nsIFrame* frame = this; frame; frame = frame->GetNextInFlow()) {
@@ -235,15 +233,6 @@ nsRubyBaseContainerFrame::IsFrameOfType(uint32_t aFlags) const
          ~(nsIFrame::eLineParticipant));
 }
 
-void
-nsRubyBaseContainerFrame::GetTextContainers(TextContainerArray& aTextContainers)
-{
-  MOZ_ASSERT(aTextContainers.IsEmpty());
-  for (RubyTextContainerIterator iter(this); !iter.AtEnd(); iter.Next()) {
-    aTextContainers.AppendElement(iter.GetTextContainer());
-  }
-}
-
 /* virtual */ bool
 nsRubyBaseContainerFrame::CanContinueTextRun() const
 {
@@ -275,7 +264,7 @@ struct nsRubyBaseContainerFrame::ReflowState
 {
   bool mAllowInitialLineBreak;
   bool mAllowLineBreak;
-  const TextContainerArray& mTextContainers;
+  const AutoRubyTextContainerArray& mTextContainers;
   const nsHTMLReflowState& mBaseReflowState;
   const nsTArray<UniquePtr<nsHTMLReflowState>>& mTextReflowStates;
 };
@@ -298,11 +287,9 @@ nsRubyBaseContainerFrame::Reflow(nsPresContext* aPresContext,
     return;
   }
 
-  AutoTextContainerArray textContainers;
-  GetTextContainers(textContainers);
-
   MoveOverflowToChildList();
   // Ask text containers to drain overflows
+  AutoRubyTextContainerArray textContainers(this);
   const uint32_t rtcCount = textContainers.Length();
   for (uint32_t i = 0; i < rtcCount; i++) {
     textContainers[i]->MoveOverflowToChildList();
@@ -441,10 +428,10 @@ struct MOZ_STACK_CLASS nsRubyBaseContainerFrame::PullFrameState
 {
   ContinuationTraversingState mBase;
   nsAutoTArray<ContinuationTraversingState, RTC_ARRAY_SIZE> mTexts;
-  const TextContainerArray& mTextContainers;
+  const AutoRubyTextContainerArray& mTextContainers;
 
   PullFrameState(nsRubyBaseContainerFrame* aBaseContainer,
-                 const TextContainerArray& aTextContainers);
+                 const AutoRubyTextContainerArray& aTextContainers);
 };
 
 nscoord
@@ -695,7 +682,7 @@ nsRubyBaseContainerFrame::ReflowOneColumn(const ReflowState& aReflowState,
 
 nsRubyBaseContainerFrame::PullFrameState::PullFrameState(
     nsRubyBaseContainerFrame* aBaseContainer,
-    const TextContainerArray& aTextContainers)
+    const AutoRubyTextContainerArray& aTextContainers)
   : mBase(aBaseContainer)
   , mTextContainers(aTextContainers)
 {
@@ -711,7 +698,8 @@ nsRubyBaseContainerFrame::PullOneColumn(nsLineLayout* aLineLayout,
                                         RubyColumn& aColumn,
                                         bool& aIsComplete)
 {
-  const TextContainerArray& textContainers = aPullFrameState.mTextContainers;
+  const AutoRubyTextContainerArray& textContainers =
+    aPullFrameState.mTextContainers;
   const uint32_t rtcCount = textContainers.Length();
 
   nsIFrame* nextBase = GetNextInFlowChild(aPullFrameState.mBase);
diff --git a/layout/generic/nsRubyBaseContainerFrame.h b/layout/generic/nsRubyBaseContainerFrame.h
index 10b4c22e65e..3b7b1af2cea 100644
--- a/layout/generic/nsRubyBaseContainerFrame.h
+++ b/layout/generic/nsRubyBaseContainerFrame.h
@@ -9,7 +9,6 @@
 #ifndef nsRubyBaseContainerFrame_h___
 #define nsRubyBaseContainerFrame_h___
 
-#include "RubyUtils.h"
 #include "nsContainerFrame.h"
 
 /**
@@ -19,6 +18,10 @@
 nsContainerFrame* NS_NewRubyBaseContainerFrame(nsIPresShell* aPresShell,
                                                nsStyleContext* aContext);
 
+namespace mozilla {
+struct RubyColumn;
+}
+
 class nsRubyBaseContainerFrame final : public nsContainerFrame
 {
 public:
@@ -61,10 +64,6 @@ protected:
                                  nsStyleContext* aContext);
   explicit nsRubyBaseContainerFrame(nsStyleContext* aContext) : nsContainerFrame(aContext) {}
 
-  typedef nsTArray<nsRubyTextContainerFrame*> TextContainerArray;
-  typedef nsAutoTArray<nsRubyTextContainerFrame*, RTC_ARRAY_SIZE> AutoTextContainerArray;
-  void GetTextContainers(TextContainerArray& aTextContainers);
-
   struct ReflowState;
   nscoord ReflowColumns(const ReflowState& aReflowState,
                         nsReflowStatus& aStatus);
diff --git a/layout/generic/nsRubyFrame.cpp b/layout/generic/nsRubyFrame.cpp
index a31e14d1c00..5029d8bab18 100644
--- a/layout/generic/nsRubyFrame.cpp
+++ b/layout/generic/nsRubyFrame.cpp
@@ -177,10 +177,7 @@ nsRubyFrame::ReflowSegment(nsPresContext* aPresContext,
   NS_ASSERTION(!rubyWM.IsOrthogonalTo(lineWM),
                "Ruby frame writing-mode shouldn't be orthogonal to its line");
 
-  nsAutoTArray<nsRubyTextContainerFrame*, RTC_ARRAY_SIZE> textContainers;
-  for (RubyTextContainerIterator iter(aBaseContainer); !iter.AtEnd(); iter.Next()) {
-    textContainers.AppendElement(iter.GetTextContainer());
-  }
+  AutoRubyTextContainerArray textContainers(aBaseContainer);
   const uint32_t rtcCount = textContainers.Length();
 
   nsHTMLReflowMetrics baseMetrics(aReflowState);