MacViews: Get views based toolbar to compile on the Mac.

chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.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_TOOLBAR_TOOLBAR_BUTTON_H_
-#define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_H_
+#ifndef CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_
+#define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 
 // NSButton subclass which handles middle mouse clicking.
 
 @interface ToolbarButton : NSButton {
  @protected
   // YES when middle mouse clicks should be handled.
   BOOL handleMiddleClick_;
 }
 
 // Whether or not to handle the mouse middle click events.
 @property(assign, nonatomic) BOOL handleMiddleClick;
 
 @end
 
 @interface ToolbarButton (ExposedForTesting)
 - (BOOL)shouldHandleEvent:(NSEvent*)theEvent;
 @end
 
-#endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_H_
+#endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_