Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/first_run_bubble_controller.h

 // 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.
 
+#ifndef CHROME_BROWSER_UI_COCOA_FIRST_RUN_BUBBLE_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_FIRST_RUN_BUBBLE_CONTROLLER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 
 class Browser;
 class Profile;
 
 // Manages the first run bubble.
 @interface FirstRunBubbleController : BaseBubbleController {
  @private
   IBOutlet NSTextField* header_;
   Browser* browser_;
   Profile* profile_;
 }
 
 // Creates and shows a first run bubble. |browser| is NULL in unittests.
 + (FirstRunBubbleController*) showForView:(NSView*)view
                                    offset:(NSPoint)offset
                                   browser:(Browser*)browser
                                   profile:(Profile*)profile;
 
 // Handle the bubble's 'Change' button; direct users to search engine options.
 - (IBAction)onChange:(id)sender;
 
 @end
+
+#endif  // CHROME_BROWSER_UI_COCOA_FIRST_RUN_BUBBLE_CONTROLLER_H_