Simplify handling of BiDi cursor movement

ui/views/controls/textfield/textfield_views_model.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_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #pragma once
 
 #include <list>
 #include <vector>
@@ skipping 241 matching lines @@
   // edit in the edit history.
   void ReplaceTextInternal(const string16& text, bool mergeable);
 
   // Clears all edit history.
   void ClearEditHistory();
 
   // Clears redo history.
   void ClearRedoHistory();
 
   // Executes and records edit operations.
-  void ExecuteAndRecordDelete(size_t from, size_t to, bool mergeable);
+  void ExecuteAndRecordDelete(ui::Range range, bool mergeable);
   void ExecuteAndRecordReplaceSelection(internal::MergeType merge_type,
                                         const string16& text);
   void ExecuteAndRecordReplace(internal::MergeType merge_type,
                                size_t old_cursor_pos,
                                size_t new_cursor_pos,
                                const string16& text,
                                size_t new_text_start);
   void ExecuteAndRecordInsert(const string16& text, bool mergeable);
 
   // Adds or merge |edit| into edit history. Return true if the edit
@@ skipping 35 matching lines @@
   // 2) new edit is added. (redo history is cleared)
   // 3) redone all undone edits.
   EditHistory::iterator current_edit_;
 
   DISALLOW_COPY_AND_ASSIGN(TextfieldViewsModel);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_