Moved ExtensionPrefs and related into extensions namespace

chrome/browser/extensions/installed_loader.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_EXTENSIONS_INSTALLED_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_INSTALLED_LOADER_H_
 #pragma once
 
-class ExtensionPrefs;
 class ExtensionService;
 
 namespace extensions {
 
+class ExtensionPrefs;
 struct ExtensionInfo;
 
 // Loads installed extensions from the prefs.
 class InstalledLoader {
  public:
   explicit InstalledLoader(ExtensionService* extension_service);
   virtual ~InstalledLoader();
 
   // Loads extension from prefs.
   void Load(const ExtensionInfo& info, bool write_to_prefs);
 
   // Loads all installed extensions (used by startup and testing code).
   void LoadAllExtensions();
 
  private:
   // Returns the flags that should be used with Extension::Create() for an
   // extension that is already installed.
   int GetCreationFlags(const ExtensionInfo* info);
 
   ExtensionService* extension_service_;
 
   ExtensionPrefs* extension_prefs_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_INSTALLED_LOADER_H_