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

chrome/browser/component_updater/flash_component_installer.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_COMPONENT_UPDATER_FLASH_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_FLASH_COMPONENT_INSTALLER_H_
 #pragma once
 
 class ComponentUpdateService;
-class FilePath;
 class Version;
 
 namespace base {
 class DictionaryValue;
 }
 
 // Component update registration for built-in flash player (non-Pepper).
 void RegisterNPAPIFlashComponent(ComponentUpdateService* cus);
 
 // Our job is to 1) find what Pepper flash is installed (if any) and 2) register
 // with the component updater to download the latest version when available.
 // The first part is IO intensive so we do it asynchronously in the file thread.
 void RegisterPepperFlashComponent(ComponentUpdateService* cus);
 
 // Returns true if this browser implements all the interfaces that Flash
 // specifies in its component installer manifest.
 bool VetoPepperFlashIntefaces(base::DictionaryValue* manifest);
 
 // Returns true if this browser is compatible with the given Pepper Flash
 // manifest, with the version specified in the manifest in |version_out|.
 bool CheckPepperFlashManifest(base::DictionaryValue* manifest,
                               Version* version_out);
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_FLASH_COMPONENT_INSTALLER_H_