Get rid of flat tree version of createVisibleSelection() taking two VisiblePositionInFlatTree

third_party/WebKit/Source/core/editing/VisibleSelection.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 132 matching lines @@
   DCHECK(!needsLayoutTreeUpdate(extent));
   // TODO(yosin): We should use |Builder::setBaseAndExtent()| once we get rid
   // of callers passing |base.istNull()| but |extent.isNotNull()|.
   SelectionInFlatTree::Builder builder;
   builder.setBaseAndExtentDeprecated(base, extent)
       .setAffinity(affinity)
       .setIsDirectional(isDirectional);
   return createVisibleSelection(builder.build());
 }
 
-VisibleSelectionInFlatTree createVisibleSelection(
-    const VisiblePositionInFlatTree& base,
-    const VisiblePositionInFlatTree& extent,
-    bool isDirectional) {
-  DCHECK(base.isValid());
-  DCHECK(extent.isValid());
-  // TODO(xiaochengh): We should check |base.isNotNull() || extent.isNull()|
-  // after all call sites have ensured that.
-  return createVisibleSelection(base.deepEquivalent(), extent.deepEquivalent(),
-                                base.affinity(), isDirectional);
-}
-
 template <typename Strategy>
 static SelectionType computeSelectionType(
     const PositionTemplate<Strategy>& start,
     const PositionTemplate<Strategy>& end) {
   if (start.isNull()) {
     DCHECK(end.isNull());
     return NoSelection;
   }
   if (start == end)
     return CaretSelection;
@@ skipping 758 matching lines @@
 
 void showTree(const blink::VisibleSelectionInFlatTree& sel) {
   sel.showTreeForThis();
 }
 
 void showTree(const blink::VisibleSelectionInFlatTree* sel) {
   if (sel)
     sel->showTreeForThis();
 }
 #endif