Get rid of unused member function toNormalizedRange() from FrameSelection and VisibleSelection class

Source/core/editing/FrameSelection.h

Index: Source/core/editing/FrameSelection.h
diff --git a/Source/core/editing/FrameSelection.h b/Source/core/editing/FrameSelection.h
index ac38775d8e90909918e73046d79d1fbf464aa678..b53748be86c4378f199760db970a88e87fa5e447 100644
--- a/Source/core/editing/FrameSelection.h
+++ b/Source/core/editing/FrameSelection.h
@@ -169,8 +169,6 @@ public:
     // the return value from underlying VisibleSelection's firstRange() is returned.
     PassRefPtrWillBeRawPtr<Range> firstRange() const;
 
-    PassRefPtrWillBeRawPtr<Range> toNormalizedRange() const { return m_selection.toNormalizedRange(); }
-
     void nodeWillBeRemoved(Node&);
     void didUpdateCharacterData(CharacterData*, unsigned offset, unsigned oldLength, unsigned newLength);
     void didMergeTextNodes(const Text& oldNode, unsigned offset);