Notify GCMAppHandlers when the store is reset, so they clear cached IDs

components/gcm_driver/default_gcm_app_handler.cc

 // Copyright (c) 2014 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.
 
 #include "components/gcm_driver/default_gcm_app_handler.h"
 
 #include "base/logging.h"
 
 namespace gcm {
 
 DefaultGCMAppHandler::DefaultGCMAppHandler() {
 }
 
 DefaultGCMAppHandler::~DefaultGCMAppHandler() {
 }
 
 void DefaultGCMAppHandler::ShutdownHandler() {
   // Nothing to do.
 }
 
+void DefaultGCMAppHandler::OnStoreReset() {
+  // Nothing to do.
+}
+
 void DefaultGCMAppHandler::OnMessage(const std::string& app_id,
                                      const IncomingMessage& message) {
   DVLOG(1) << "No app handler is found to route message for " << app_id;
 }
 
 void DefaultGCMAppHandler::OnMessagesDeleted(const std::string& app_id) {
   DVLOG(1) << "No app handler is found to route deleted message for " << app_id;
 }
 
 void DefaultGCMAppHandler::OnSendError(
     const std::string& app_id,
     const GCMClient::SendErrorDetails& send_error_details) {
   DVLOG(1) << "No app handler is found to route send error message for "
            << app_id;
 }
 
 void DefaultGCMAppHandler::OnSendAcknowledged(const std::string& app_id,
                                               const std::string& message_id) {
   DVLOG(1) << "No app handler is found to route send acknoledgement for "
            << app_id;
 }
 
 }  // namespace gcm