Consolidate RenderText adjacent word selection model code.

ui/gfx/render_text.h

 // 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.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 349 matching lines @@
                                            VisualCursorDirection direction);
 
   // Get the selection model visually left/right of |selection| by one grapheme.
   // The returned value represents a cursor/caret position without a selection.
   virtual SelectionModel AdjacentCharSelectionModel(
       const SelectionModel& selection,
       VisualCursorDirection direction) = 0;
 
   // Get the selection model visually left/right of |selection| by one word.
   // The returned value represents a cursor/caret position without a selection.
-  virtual SelectionModel AdjacentWordSelectionModel(
-      const SelectionModel& selection,
-      VisualCursorDirection direction) = 0;
+  SelectionModel AdjacentWordSelectionModel(const SelectionModel& selection,
+                                            VisualCursorDirection direction);
 
   // Get the SelectionModels corresponding to visual text ends.
   // The returned value represents a cursor/caret position without a selection.
   SelectionModel EdgeSelectionModel(VisualCursorDirection direction);
 
   // Sets the selection model, the argument is assumed to be valid.
   virtual void SetSelectionModel(const SelectionModel& model);
 
   // Get the horizontal bounds (relative to the left of the text, not the view)
   // of the glyph starting at |index|. If the glyph is RTL then the returned
@@ skipping 189 matching lines @@
 
   // Text shadows to be drawn.
   ShadowValues text_shadows_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_