Remove PREVIOUS_GRAPHEME_TRAILING.

ui/gfx/render_text.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include <algorithm>
 #include <vector>
@@ skipping 72 matching lines @@
 // "abcFED|".
 // So, besides the logical selection start point and end point, we need extra
 // information to specify to which character and on which edge of the character
 // the visual cursor is bound to. For example, the visual cursor is bound to
 // the trailing side of the 2nd character 'c' when pointing to right half of
 // 'c'. And it is bound to the leading edge of the 3rd character 'D' when
 // pointing to right of 'D'.
 class UI_EXPORT SelectionModel {
  public:
   enum CaretPlacement {
-    // PREVIOUS_GRAPHEME_TRAILING means cursor is visually attached to the
-    // trailing edge of previous grapheme.
-    PREVIOUS_GRAPHEME_TRAILING,
     LEADING,
     TRAILING,
   };
 
   SelectionModel();
   explicit SelectionModel(size_t pos);
+  SelectionModel(size_t start, size_t end);
   SelectionModel(size_t end, size_t pos, CaretPlacement status);
   SelectionModel(size_t start, size_t end, size_t pos, CaretPlacement status);
 
   virtual ~SelectionModel();
 
   size_t selection_start() const { return selection_start_; }
   void set_selection_start(size_t pos) { selection_start_ = pos; }
 
   size_t selection_end() const { return selection_end_; }
   void set_selection_end(size_t pos) { selection_end_ = pos; }
@@ skipping 158 matching lines @@
   const StyleRanges& style_ranges() const { return style_ranges_; }
 
   // Get the selection model that visually neighbors |position| by |break_type|.
   // The returned value represents a cursor/caret position without a selection.
   virtual SelectionModel GetLeftSelectionModel(const SelectionModel& current,
                                                BreakType break_type);
   virtual SelectionModel GetRightSelectionModel(const SelectionModel& current,
                                                 BreakType break_type);
 
   // Get the logical index of the grapheme preceeding the argument |position|.
-  virtual size_t GetIndexOfPreviousGrapheme(size_t position) const;
+  virtual size_t GetIndexOfPreviousGrapheme(size_t position);
 
   // Apply composition style (underline) to composition range and selection
   // style (foreground) to selection range.
   void ApplyCompositionAndSelectionStyles(StyleRanges* style_ranges) const;
 
  private:
   friend class RenderTextTest;
 
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, DefaultStyle);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, CustomDefaultStyle);
@@ skipping 43 matching lines @@
   // SetCursorPosition, SetSelectionModel, Font related style change, and other
   // operations that adjust the visible text bounds.
   bool cached_bounds_and_offset_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_