Move Extension into extensions namespace

chrome/browser/web_applications/web_app.h

 // Copyright (c) 2012 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_WEB_APPLICATIONS_WEB_APP_H_
 #define CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "build/build_config.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/common/web_apps.h"
 
+namespace extensions {
 class Extension;
+}
 
 namespace web_app {
 
 // Gets the user data directory for given web app. The path for the directory is
 // based on |extension_id|. If |extension_id| is empty then |url| is used
 // to construct a unique ID.
 FilePath GetWebAppDataDirectory(const FilePath& profile_path,
                                 const std::string& extension_id,
                                 const GURL& url);
 
 // Gets the user data directory to use for |extension| located inside
 // |profile_path|.
 FilePath GetWebAppDataDirectory(const FilePath& profile_path,
-                                const Extension& extension);
+                                const extensions::Extension& extension);
 
 // Compute a deterministic name based on data in the shortcut_info.
 std::string GenerateApplicationNameFromInfo(
     const ShellIntegration::ShortcutInfo& shortcut_info);
 
 // Compute a deterministic name based on the URL. We use this pseudo name
 // as a key to store window location per application URLs in Browser and
 // as app id for BrowserWindow, shortcut and jump list.
 std::string GenerateApplicationNameFromURL(const GURL& url);
 
@@ skipping 55 matching lines @@
 
 // Sanitizes |name| and returns a version of it that is safe to use as an
 // on-disk file name .
 FilePath GetSanitizedFileName(const string16& name);
 
 }  // namespace internals
 
 }  // namespace web_app
 
 #endif  // CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_