Cleanup: Remove some unneeded Extension* class forward declarations.

chrome/browser/ui/webui/extensions/extension_loader_handler.h

 // Copyright 2014 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_WEBUI_EXTENSIONS_EXTENSION_LOADER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_LOADER_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace content {
 class WebUIDataSource;
 }
 
-class ExtensionService;
 class Profile;
 
 namespace extensions {
 
 class Extension;
 
 // The handler page for the Extension Commands UI overlay.
 class ExtensionLoaderHandler : public content::WebUIMessageHandler {
  public:
   explicit ExtensionLoaderHandler(Profile* profile);
@@ skipping 40 matching lines @@
 
   // Weak pointer factory for posting background tasks.
   base::WeakPtrFactory<ExtensionLoaderHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionLoaderHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_LOADER_HANDLER_H_