Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/notifications/balloon_host.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_NOTIFICATIONS_BALLOON_HOST_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/tab_contents/tab_contents_delegate.h"
 #include "content/browser/tab_contents/tab_contents_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Balloon;
 class Browser;
 class Profile;
 class SiteInstance;
-struct WebPreferences;
 
 namespace IPC {
 class Message;
 }
 
 class BalloonHost : public TabContentsDelegate,
                     public TabContentsObserver,
                     public ExtensionFunctionDispatcher::Delegate {
  public:
   explicit BalloonHost(Balloon* balloon);
@@ skipping 58 matching lines @@
   // Site instance for the balloon/profile, to be used for opening new links.
   scoped_refptr<SiteInstance> site_instance_;
 
   // A flag to enable Web UI.
   bool enable_web_ui_;
 
   ExtensionFunctionDispatcher extension_function_dispatcher_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_HOST_H_