AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/views/toolbar/reload_button.h

 // Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_TOOLBAR_RELOAD_BUTTON_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_RELOAD_BUTTON_H_
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/ui/views/toolbar/toolbar_button.h"
@@ skipping 45 matching lines @@
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* /* button */,
                      const ui::Event& event) override;
 
   // ui::SimpleMenuModel::Delegate:
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
   bool IsCommandIdVisible(int command_id) const override;
   bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) override;
+                                  ui::Accelerator* accelerator) const override;
   void ExecuteCommand(int command_id, int event_flags) override;
 
  private:
   friend class ReloadButtonTest;
 
   ui::SimpleMenuModel* CreateMenuModel();
 
   void ExecuteBrowserCommand(int command, int event_flags);
   void ChangeModeInternal(Mode mode);
 
@@ skipping 24 matching lines @@
   // True if we should pretend the button is hovered.
   bool testing_mouse_hovered_;
   // Increments when we would tell the browser to "reload", so
   // test code can tell whether we did so (as there may be no |browser_|).
   int testing_reload_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ReloadButton);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_RELOAD_BUTTON_H_