diff --git a/layout/base/FrameLayerBuilder.h b/layout/base/FrameLayerBuilder.h
index 1581557da12..40e993bda42 100644
--- a/layout/base/FrameLayerBuilder.h
+++ b/layout/base/FrameLayerBuilder.h
@@ -47,6 +47,8 @@ enum LayerState {
 };
 
 class RefCountedRegion {
+private:
+  ~RefCountedRegion() {}
 public:
   NS_INLINE_DECL_REFCOUNTING(RefCountedRegion)
 
diff --git a/layout/style/AnimationCommon.h b/layout/style/AnimationCommon.h
index adf49e6b740..6d83a6361c0 100644
--- a/layout/style/AnimationCommon.h
+++ b/layout/style/AnimationCommon.h
@@ -282,6 +282,10 @@ struct ComputedTiming
  */
 struct ElementAnimation
 {
+protected:
+  virtual ~ElementAnimation() { }
+
+public:
   ElementAnimation()
     : mIsRunningOnCompositor(false)
     , mLastNotification(LAST_NOTIFICATION_NONE)
@@ -291,7 +295,6 @@ struct ElementAnimation
   // FIXME: If we succeed in moving transition-specific code to a type of
   // AnimationEffect (as per the Web Animations API) we should remove these
   // virtual methods.
-  virtual ~ElementAnimation() { }
   virtual ElementPropertyTransition* AsTransition() { return nullptr; }
   virtual const ElementPropertyTransition* AsTransition() const {
     return nullptr;
diff --git a/layout/style/CounterStyleManager.cpp b/layout/style/CounterStyleManager.cpp
index a7c9253419a..087af1b29bf 100644
--- a/layout/style/CounterStyleManager.cpp
+++ b/layout/style/CounterStyleManager.cpp
@@ -933,6 +933,8 @@ BuiltinCounterStyle::GetInitialCounterText(CounterValue aOrdinal,
 
 class DependentBuiltinCounterStyle MOZ_FINAL : public BuiltinCounterStyle
 {
+private:
+  ~DependentBuiltinCounterStyle() {}
 public:
   DependentBuiltinCounterStyle(int32_t aStyle, CounterStyleManager* aManager)
     : BuiltinCounterStyle(aStyle), 
@@ -978,6 +980,8 @@ DependentBuiltinCounterStyle::GetFallback()
 
 class CustomCounterStyle MOZ_FINAL : public CounterStyle
 {
+private:
+  ~CustomCounterStyle() {}
 public:
   CustomCounterStyle(CounterStyleManager* aManager,
                      nsCSSCounterStyleRule* aRule)
diff --git a/layout/style/CounterStyleManager.h b/layout/style/CounterStyleManager.h
index aac49300732..af8f6ea93ef 100644
--- a/layout/style/CounterStyleManager.h
+++ b/layout/style/CounterStyleManager.h
@@ -101,9 +101,10 @@ protected:
 
 class CounterStyleManager MOZ_FINAL
 {
+private:
+  ~CounterStyleManager();
 public:
   CounterStyleManager(nsPresContext* aPresContext);
-  ~CounterStyleManager();
 
   static void InitializeBuiltinCounterStyles();
 
diff --git a/layout/style/nsCSSValue.h b/layout/style/nsCSSValue.h
index c7c8d9a711a..85acbfba04c 100644
--- a/layout/style/nsCSSValue.h
+++ b/layout/style/nsCSSValue.h
@@ -83,8 +83,10 @@ struct URLValue {
   URLValue(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
            nsIPrincipal* aOriginPrincipal);
 
+protected:
   ~URLValue();
 
+public:
   bool operator==(const URLValue& aOther) const;
 
   // URIEquals only compares URIs and principals (unlike operator==, which
@@ -124,8 +126,10 @@ struct ImageValue : public URLValue {
   // aString must not be null.
   ImageValue(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
              nsIPrincipal* aOriginPrincipal, nsIDocument* aDocument);
+private:
   ~ImageValue();
 
+public:
   // Inherit operator== from URLValue
 
   nsRefPtrHashtable<nsPtrHashKey<nsISupports>, imgRequestProxy> mRequests;