Cleanup: Remove unneeded forward declarations from chrome/browser/ui/gtk and chrome/browser/ui/co...

chrome/browser/ui/cocoa/notifications/balloon_view_host_mac.h

Index: chrome/browser/ui/cocoa/notifications/balloon_view_host_mac.h
===================================================================
--- chrome/browser/ui/cocoa/notifications/balloon_view_host_mac.h	(revision 109585)
+++ chrome/browser/ui/cocoa/notifications/balloon_view_host_mac.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -8,9 +8,6 @@
 
 #include "chrome/browser/notifications/balloon_host.h"
 
-class RenderWidgetHostView;
-class RenderWidgetHostViewMac;
-
 // BalloonViewHost class is a delegate to the renderer host for the HTML
 // notification.  When initialized it creates a new RenderViewHost and loads
 // the contents of the toast into it.  It also handles links within the toast,