Consolidate RenderText adjacent word selection model code.

ui/gfx/render_text_mac.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/render_text_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 43 matching lines @@
   return spans;
 }
 
 SelectionModel RenderTextMac::AdjacentCharSelectionModel(
     const SelectionModel& selection,
     VisualCursorDirection direction) {
   // TODO(asvitkine): Implement this. http://crbug.com/131618
   return SelectionModel();
 }
 
-SelectionModel RenderTextMac::AdjacentWordSelectionModel(
-    const SelectionModel& selection,
-    VisualCursorDirection direction) {
-  // TODO(asvitkine): Implement this. http://crbug.com/131618
-  return SelectionModel();
-}
-
 ui::Range RenderTextMac::GetGlyphBounds(size_t index) {
   // TODO(asvitkine): Implement this. http://crbug.com/131618
   return ui::Range();
 }
 
 std::vector<Rect> RenderTextMac::GetSubstringBounds(const ui::Range& range) {
   // TODO(asvitkine): Implement this. http://crbug.com/131618
   return std::vector<Rect>();
 }
 
@@ skipping 243 matching lines @@
     run_origin.offset(run_width, 0);
   }
   runs_valid_ = true;
 }
 
 RenderText* RenderText::CreateInstance() {
   return new RenderTextMac;
 }
 
 }  // namespace gfx