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

Source/core/editing/VisibleSelection.h

Index: Source/core/editing/VisibleSelection.h
diff --git a/Source/core/editing/VisibleSelection.h b/Source/core/editing/VisibleSelection.h
index ef29a637343b7302b955784c1fdda97508d7c868..4e8599042dbc4cfed319d5a369ea0e2b7d1bb522 100644
--- a/Source/core/editing/VisibleSelection.h
+++ b/Source/core/editing/VisibleSelection.h
@@ -155,11 +155,10 @@ public:
 
     bool intersectsNode(Node*) const;
 
-    // FIXME: Most callers probably don't want these functions, but
-    // are using them for historical reasons. toNormalizedRange and
-    // toNormalizedEphemeralRange contracts the range around text, and
-    // moves the caret upstream before returning the range/positions.
-    PassRefPtrWillBeRawPtr<Range> toNormalizedRange() const;
+    // TODO(yosin) Most callers probably don't want these functions, but
+    // are using them for historical reasons. |toNormalizedEphemeralRange()|
+    // contracts the range around text, and moves the caret most backward
+    // visually equivalent position before returning the range/positions.
     EphemeralRange toNormalizedEphemeralRange() const;
     static EphemeralRange normalizeRange(const EphemeralRange&);
     static EphemeralRangeInComposedTree normalizeRange(const EphemeralRangeInComposedTree&);