diff --git a/toolkit/components/url-classifier/ChunkSet.cpp b/toolkit/components/url-classifier/ChunkSet.cpp
index 5d48c95ea25..c05eb502d10 100644
--- a/toolkit/components/url-classifier/ChunkSet.cpp
+++ b/toolkit/components/url-classifier/ChunkSet.cpp
@@ -46,14 +46,6 @@ ChunkSet::Set(uint32_t aChunk)
   return NS_OK;
 }
 
-nsresult
-ChunkSet::Unset(uint32_t aChunk)
-{
-  mChunks.RemoveElementSorted(aChunk);
-
-  return NS_OK;
-}
-
 bool
 ChunkSet::Has(uint32_t aChunk) const
 {
diff --git a/toolkit/components/url-classifier/ChunkSet.h b/toolkit/components/url-classifier/ChunkSet.h
index a39574c3202..d99775034df 100644
--- a/toolkit/components/url-classifier/ChunkSet.h
+++ b/toolkit/components/url-classifier/ChunkSet.h
@@ -6,7 +6,6 @@
 #ifndef ChunkSet_h__
 #define ChunkSet_h__
 
-
 #include "Entries.h"
 #include "nsString.h"
 #include "nsTArray.h"
@@ -27,26 +26,19 @@ public:
 
   nsresult Serialize(nsACString& aStr);
   nsresult Set(uint32_t aChunk);
-  nsresult Unset(uint32_t aChunk);
-  void Clear();
-  nsresult Merge(const ChunkSet& aOther);
-  nsresult Remove(const ChunkSet& aOther);
-
   bool Has(uint32_t chunk) const;
-
+  nsresult Merge(const ChunkSet& aOther);
   uint32_t Length() const { return mChunks.Length(); }
+  nsresult Remove(const ChunkSet& aOther);
+  void Clear();
 
   nsresult Write(nsIOutputStream* aOut) {
     return WriteTArray(aOut, mChunks);
   }
-
   nsresult Read(nsIInputStream* aIn, uint32_t aNumElements) {
     return ReadTArray(aIn, &mChunks, aNumElements);
   }
 
-  uint32_t *Begin() { return mChunks.Elements(); }
-  uint32_t *End() { return mChunks.Elements() + mChunks.Length(); }
-
 private:
   nsTArray<uint32_t> mChunks;
 };