AcceleratorProvider: Make GetAcceleratorForCommandId const.

ui/base/models/simple_menu_model.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/base/models/simple_menu_model.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 238 matching lines @@
 void SimpleMenuModel::SetMinorText(int index,
                                    const base::string16& minor_text) {
   items_[ValidateItemIndex(index)].minor_text = minor_text;
 }
 
 void SimpleMenuModel::Clear() {
   items_.clear();
   MenuItemsChanged();
 }
 
-int SimpleMenuModel::GetIndexOfCommandId(int command_id) {
-  for (ItemVector::iterator i = items_.begin(); i != items_.end(); ++i) {
+int SimpleMenuModel::GetIndexOfCommandId(int command_id) const {
+  for (ItemVector::const_iterator i = items_.begin(); i != items_.end(); ++i) {
     if (i->command_id == command_id)
       return static_cast<int>(std::distance(items_.begin(), i));
   }
   return -1;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleMenuModel, MenuModel implementation:
 
 bool SimpleMenuModel::HasIcons() const {
@@ skipping 174 matching lines @@
 #ifndef NDEBUG
   if (item.type == TYPE_SEPARATOR) {
     DCHECK_EQ(item.command_id, kSeparatorId);
   } else {
     DCHECK_GE(item.command_id, 0);
   }
 #endif  // NDEBUG
 }
 
 }  // namespace ui