Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/history_menu_cocoa_controller.h

Index: chrome/browser/ui/cocoa/history_menu_cocoa_controller.h
diff --git a/chrome/browser/ui/cocoa/history_menu_cocoa_controller.h b/chrome/browser/ui/cocoa/history_menu_cocoa_controller.h
index d6fd3c16a9bc61ad09a1ddfbc25e695d4894cc97..f29057b70452287109e3d8fd24bc182919ee9e96 100644
--- a/chrome/browser/ui/cocoa/history_menu_cocoa_controller.h
+++ b/chrome/browser/ui/cocoa/history_menu_cocoa_controller.h
@@ -2,16 +2,15 @@
 // 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