chrome: Cleanup class/struct forward declarations

chrome/browser/ui/cocoa/infobars/infobar_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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 
 @protocol InfoBarContainerControllerBase;
 class InfoBarCocoa;
-class InfoBarService;
 @class InfoBarGradientView;
 
 namespace infobars {
 class InfoBarDelegate;
 }
 
 // A controller for an infobar in the browser window.  There is one
 // controller per infobar view.  The base InfoBarController is able to
 // draw an icon, a text message, and a close button.  Subclasses can
 // override addAdditionalControls to customize the UI.
@@ skipping 71 matching lines @@
 @interface InfoBarController (Protected)
 // Disables the provided menu.  Subclasses should call this for each popup menu
 // in -infobarWillClose.
 - (void)disablePopUpMenu:(NSMenu*)menu;
 @end
 
 /////////////////////////////////////////////////////////////////////////
 // InfoBarController subclasses, one for each InfoBarDelegate
 // subclass.  Each of these subclasses overrides addAdditionalControls to
 // configure its view as necessary.