AcceleratorProvider: Make GetAcceleratorForCommandId const.

ui/views/controls/textfield/textfield.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/views/controls/textfield/textfield.h"
 
 #include <string>
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
@@ skipping 1161 matching lines @@
 bool Textfield::IsCommandIdChecked(int command_id) const {
   return true;
 }
 
 bool Textfield::IsCommandIdEnabled(int command_id) const {
   return Textfield::IsTextEditCommandEnabled(
       GetTextEditCommandFromMenuCommand(command_id, HasSelection()));
 }
 
 bool Textfield::GetAcceleratorForCommandId(int command_id,
-                                           ui::Accelerator* accelerator) {
+                                           ui::Accelerator* accelerator) const {
   switch (command_id) {
     case IDS_APP_UNDO:
       *accelerator = ui::Accelerator(ui::VKEY_Z, ui::EF_CONTROL_DOWN);
       return true;
 
     case IDS_APP_CUT:
       *accelerator = ui::Accelerator(ui::VKEY_X, ui::EF_CONTROL_DOWN);
       return true;
 
     case IDS_APP_COPY:
@@ skipping 775 matching lines @@
     RequestFocus();
   model_->MoveCursorTo(mouse);
   if (!selection_clipboard_text.empty()) {
     model_->InsertText(selection_clipboard_text);
     UpdateAfterChange(true, true);
   }
   OnAfterUserAction();
 }
 
 }  // namespace views