Move Extension into extensions namespace

chrome/browser/extensions/default_apps.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_DEFAULT_APPS_H_
 #define CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/extensions/external_extension_provider_impl.h"
 
 class PrefService;
 class Profile;
 
+namespace extensions {
+class Extension;
+}
+
 // Functions and types related to installing default apps.
 namespace default_apps {
 
 // These enum values are persisted in the user preferences, so they should not
 // be changed.
 enum InstallState {
   kUnknown,
   kAlwaysProvideDefaultApps,
   kNeverProvideDefaultApps
 };
 
 // Register preference properties used by default apps to maintain
 // install state.
 void RegisterUserPrefs(PrefService* prefs);
 
 
 // A specialization of the ExternalExtensionProviderImpl that conditionally
 // installs apps from the chrome::DIR_DEFAULT_APPS location based on a
 // preference in the profile.
 class Provider : public ExternalExtensionProviderImpl {
  public:
   Provider(Profile* profile,
            VisitorInterface* service,
            ExternalExtensionLoader* loader,
-           Extension::Location crx_location,
-           Extension::Location download_location,
+           extensions::Extension::Location crx_location,
+           extensions::Extension::Location download_location,
            int creation_flags);
 
   // ExternalExtensionProviderImpl overrides:
   virtual void VisitRegisteredExtension() OVERRIDE;
 
  private:
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(Provider);
 };
 
 
 }  // namespace default_apps
 
 #endif  // CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_