Removing chrome.pushMessaging API

chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_mapper.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_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_MAPPER_H_
-#define CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_MAPPER_H_
-
-#include <string>
-
-namespace extensions {
-
-// Interface for mapping extension IDs to object IDs.
-// TODO(dcheng): This interface is somewhat misnamed... think of a better name.
-class PushMessagingInvalidationMapper {
- public:
-  virtual ~PushMessagingInvalidationMapper() {}
-
-  // Informs the mapper that |extension_id| was just installed. The mapper uses
-  // this information to suppress the initial invalidation on each subchannel
-  // for that extension to avoid spurious push messages at install time.
-  virtual void SuppressInitialInvalidationsForExtension(
-      const std::string& extension_id) = 0;
-
-  // Register/unregister the object IDs associated with |extension_id|.
-  virtual void RegisterExtension(const std::string& extension_id) = 0;
-  virtual void UnregisterExtension(const std::string& extension_id) = 0;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_MAPPER_H_