Consolidate manifest handler registration.

chrome/browser/extensions/api/plugins/plugins_api.h

-// Copyright (c) 2013 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_PLUGINS_PLUGINS_API_H_
-#define CHROME_BROWSER_EXTENSIONS_API_PLUGINS_PLUGINS_API_H_
-
-#include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
-#include "chrome/browser/profiles/profile_keyed_service.h"
-
-class Profile;
-
-namespace extensions {
-
-// The profile-keyed service that manages the plugins for extensions.
-class PluginsAPI : public ProfileKeyedAPI {
- public:
-  explicit PluginsAPI(Profile* profile);
-  virtual ~PluginsAPI();
-
-  // ProfileKeyedAPI implementation.
-  static ProfileKeyedAPIFactory<PluginsAPI>* GetFactoryInstance();
-
- private:
-  friend class ProfileKeyedAPIFactory<PluginsAPI>;
-
-  // ProfileKeyedAPI implementation.
-  static const char* service_name() { return "PluginsAPI"; }
-
-  DISALLOW_COPY_AND_ASSIGN(PluginsAPI);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_PLUGINS_PLUGINS_API_H_
-