Banish boilerplate. Profile-keyed API factory for extension API classes.

chrome/browser/extensions/api/tabs/tabs_windows_api.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_API_TABS_TABS_WINDOWS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_WINDOWS_API_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
 namespace extensions {
 class WindowsEventRouter;
 
-class TabsWindowsAPI : public ProfileKeyedService,
+class TabsWindowsAPI : public ProfileKeyedAPI,
                        public extensions::EventRouter::Observer {
  public:
   explicit TabsWindowsAPI(Profile* profile);
   virtual ~TabsWindowsAPI();
 
   // Convenience method to get the TabsWindowsAPI for a profile.
   static TabsWindowsAPI* Get(Profile* profile);
 
   WindowsEventRouter* windows_event_router();
 
   // ProfileKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
   // EventRouter::Observer implementation.
   virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
       OVERRIDE;
 
  private:
+  friend class ProfileKeyedAPIFactory<TabsWindowsAPI>;
+
   Profile* profile_;
 
+  // ProfileKeyedAPI implementation.
+  static const char* service_name() {
+    return "TabsWindowsAPI";
+  }
+  static const bool kServiceIsNULLWhileTesting = true;
+
   scoped_ptr<WindowsEventRouter> windows_event_router_;
 };
 
+template <>
+ProfileKeyedAPIFactory<TabsWindowsAPI>*
+ProfileKeyedAPIFactory<TabsWindowsAPI>::GetInstance();
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_WINDOWS_API_H_