Use NSMenuDelegate for browser action overflow menu to update it upon opening.

chrome/browser/ui/cocoa/extensions/browser_actions_controller.h

 // Copyright (c) 2011 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_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/memory/scoped_nsobject.h"
@@ skipping 11 matching lines @@
 
 namespace extensions {
 class Extension;
 }
 
 // Sent when the visibility of the Browser Actions changes.
 extern NSString* const kBrowserActionVisibilityChangedNotification;
 
 // Handles state and provides an interface for controlling the Browser Actions
 // container within the Toolbar.
-@interface BrowserActionsController : NSObject {
+@interface BrowserActionsController : NSObject<NSMenuDelegate> {
  @private
   // Reference to the current browser. Weak.
   Browser* browser_;
 
   // The view from Toolbar.xib we'll be rendering our browser actions in. Weak.
   BrowserActionsContainerView* containerView_;
 
   // The current profile. Weak.
   Profile* profile_;
 
@@ skipping 65 matching lines @@
 // Registers the user preferences used by this class.
 + (void)registerUserPrefs:(PrefService*)prefs;
 
 @end  // @interface BrowserActionsController
 
 @interface BrowserActionsController(TestingAPI)
 - (NSButton*)buttonWithIndex:(NSUInteger)index;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_