Move small c/b/extensions classes into extensions namespace no.2

chrome/browser/extensions/shell_window_registry.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_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_
 #define CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 #include "ui/gfx/native_widget_types.h"
 
 class Profile;
 class ShellWindow;
 
 namespace content {
 class RenderViewHost;
 }
 
+namespace extensions {
+
 // The ShellWindowRegistry tracks the ShellWindows for all platform apps for a
 // particular profile.
 // This class is planned to evolve into tracking all PlatformApps for a
 // particular profile, with a PlatformApp encapsulating all views (background
 // page, shell windows, tray view, panels etc.) and other app level behaviour
 // (e.g. notifications the app is interested in, lifetime of the background
 // page).
 class ShellWindowRegistry : public ProfileKeyedService {
  public:
   class Observer {
@@ skipping 48 matching lines @@
     virtual ProfileKeyedService* BuildServiceInstanceFor(
         Profile* profile) const OVERRIDE;
     virtual bool ServiceIsCreatedWithProfile() OVERRIDE;
     virtual bool ServiceIsNULLWhileTesting() OVERRIDE;
   };
 
   ShellWindowSet shell_windows_;
   ObserverList<Observer> observers_;
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_REGISTRY_H_