Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/base_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_BASE_BUBBLE_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_BASE_BUBBLE_CONTROLLER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #include "components/bubble/bubble_reference.h"
 
 @class InfoBubbleView;
 class TabStripModelObserverBridge;
 
 // Base class for bubble controllers. Manages a xib that contains an
@@ skipping 87 matching lines @@
 
 @end
 
 // Methods for use by subclasses.
 @interface BaseBubbleController (Protected)
 // Registers event taps *after* the window is shown so that the bubble is
 // dismissed when it resigns key. This only needs to be called if
 // |-showWindow:| is overriden and does not call super. Noop on OSes <10.7.
 - (void)registerKeyStateEventTap;
 @end
+
+#endif  // CHROME_BROWSER_UI_COCOA_BASE_BUBBLE_CONTROLLER_H_