Cleanup: Remove more forward declarations in various chrome/browser directories.

chrome/browser/sidebar/sidebar_manager.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_SIDEBAR_SIDEBAR_MANAGER_H_
 #define CHROME_BROWSER_SIDEBAR_SIDEBAR_MANAGER_H_
 
 #include <map>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "chrome/browser/sidebar/sidebar_container.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class GURL;
-class PrefService;
-class Profile;
 class SidebarContainer;
 class SkBitmap;
 class TabContents;
 
 ///////////////////////////////////////////////////////////////////////////////
 // SidebarManager
 //
 //  This class is a singleton that manages SidebarContainer instances and
 //  maintains a connection between tabs and sidebars.
 //
@@ skipping 112 matching lines @@
   typedef std::map<TabContents*, SidebarStateForTab> TabToSidebarHostMap;
   TabToSidebarHostMap tab_to_sidebar_host_;
 
   typedef std::map<SidebarContainer*, TabContents*> SidebarHostToTabMap;
   SidebarHostToTabMap sidebar_host_to_tab_;
 
   DISALLOW_COPY_AND_ASSIGN(SidebarManager);
 };
 
 #endif  // CHROME_BROWSER_SIDEBAR_SIDEBAR_MANAGER_H_
-