Cleanup: Remove unneeded forward declarations from chrome/browser/ui/webui.

chrome/browser/ui/webui/fileicon_source_chromeos.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_UI_WEBUI_FILEICON_SOURCE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_CHROMEOS_H_
 #pragma once
 
 #include <string>
+
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 
-namespace net {
-class URLRequest;
-class URLRequestJob;
-}  // namespace net
-
-class GURL;
-
 // A DataSource for chrome://fileicon/ URLs, but reads from
 // resources instead of disk. Allows for parameterization
 // via chrome://fileicon/path.ext?size=[small|medium|large]
 class FileIconSourceCros : public ChromeURLDataManager::DataSource {
  public:
   FileIconSourceCros();
 
   // Overridden from ChromeURLDataManager::DataSource.
   virtual void StartDataRequest(const std::string& url,
                                 bool is_incognito,
                                 int request_id) OVERRIDE;
   virtual std::string GetMimeType(const std::string&) const OVERRIDE;
 
  private:
   virtual ~FileIconSourceCros();
 
   DISALLOW_COPY_AND_ASSIGN(FileIconSourceCros);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_CHROMEOS_H_
-