AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/views/tabs/browser_tab_strip_controller.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 "chrome/browser/ui/views/tabs/browser_tab_strip_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/macros.h"
 #include "base/task_runner_util.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 114 matching lines @@
   }
 
   // Overridden from ui::SimpleMenuModel::Delegate:
   bool IsCommandIdChecked(int command_id) const override { return false; }
   bool IsCommandIdEnabled(int command_id) const override {
     return controller_->IsCommandEnabledForTab(
         static_cast<TabStripModel::ContextMenuCommand>(command_id),
         tab_);
   }
   bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) override {
+                                  ui::Accelerator* accelerator) const override {
     int browser_cmd;
     return TabStripModel::ContextMenuCommandToBrowserCommand(command_id,
                                                              &browser_cmd) ?
         controller_->tabstrip_->GetWidget()->GetAccelerator(browser_cmd,
                                                             accelerator) :
         false;
   }
   void CommandIdHighlighted(int command_id) override {
     controller_->StopHighlightTabsForCommand(last_command_, tab_);
     last_command_ = static_cast<TabStripModel::ContextMenuCommand>(command_id);
@@ skipping 425 matching lines @@
   content::WebPluginInfo plugin;
   tabstrip_->FileSupported(
       url,
       mime_type.empty() || mime_util::IsSupportedMimeType(mime_type) ||
           content::PluginService::GetInstance()->GetPluginInfo(
               -1,                // process ID
               MSG_ROUTING_NONE,  // routing ID
               model_->profile()->GetResourceContext(), url, GURL(), mime_type,
               false, NULL, &plugin, NULL));
 }