Allow extensions to remove and override the bookmark shortcut key

chrome/browser/ui/cocoa/accelerator_utils_cocoa.mm

 // Copyright (c) 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.
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/cocoa/accelerators_cocoa.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "ui/base/accelerators/accelerator.h"
 #import "ui/base/accelerators/platform_accelerator_cocoa.h"
@@ skipping 32 matching lines @@
                                   characters:characters
                  charactersIgnoringModifiers:characters
                                    isARepeat:NO
                                      keyCode:accelerator.key_code()];
 
   content::NativeWebKeyboardEvent keyboard_event(event);
   int id = [BrowserWindowUtils getCommandId:keyboard_event];
   return id != -1;
 }
 
+ui::Accelerator GetChromeAcceleratorForCommandId(int command_id) {
+  const ui::Accelerator* accelerator =
+      AcceleratorsCocoa::GetInstance()->GetAcceleratorForCommand(command_id);
+
+  return accelerator ? *accelerator : ui::Accelerator();
+}
+
 }  // namespace chrome