Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/history_menu_cocoa_controller.h

 // Copyright (c) 2010 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.
 
-// Controller (MVC) for the history menu. All history menu item commands get
-// directed here. This class only responds to menu events, but the actual
-// creation and maintenance of the menu happens in the Bridge.
-
 #ifndef CHROME_BROWSER_UI_COCOA_HISTORY_MENU_COCOA_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_HISTORY_MENU_COCOA_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 #import "chrome/browser/ui/cocoa/history_menu_bridge.h"
 
+// Controller (MVC) for the history menu. All history menu item commands get
+// directed here. This class only responds to menu events, but the actual
+// creation and maintenance of the menu happens in the Bridge.
 @interface HistoryMenuCocoaController : NSObject {
  @private
   HistoryMenuBridge* bridge_;  // weak; owns us
 }
 
 - (id)initWithBridge:(HistoryMenuBridge*)bridge;
 
 // Called by any history menu item.
 - (IBAction)openHistoryMenuItem:(id)sender;
 
 @end  // HistoryMenuCocoaController
 
 @interface HistoryMenuCocoaController (ExposedForUnitTests)
 - (void)openURLForItem:(const HistoryMenuBridge::HistoryItem*)node;
 @end  // HistoryMenuCocoaController (ExposedForUnitTests)
 
 #endif  // CHROME_BROWSER_UI_COCOA_HISTORY_MENU_COCOA_CONTROLLER_H_