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

components/invalidation/impl/gcm_network_channel.h

 // Copyright 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.
 
 #ifndef COMPONENTS_INVALIDATION_IMPL_GCM_NETWORK_CHANNEL_H_
 #define COMPONENTS_INVALIDATION_IMPL_GCM_NETWORK_CHANNEL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 76 matching lines @@
   friend class GCMNetworkChannelTest;
   void Register();
   void OnRegisterComplete(const std::string& registration_id,
                           gcm::GCMClient::Result result);
   void RequestAccessToken();
   void OnGetTokenComplete(const GoogleServiceAuthError& error,
                           const std::string& token);
   void OnIncomingMessage(const std::string& message,
                          const std::string& echo_token);
   void OnConnectionStateChanged(bool online);
+  void OnStoreReset();
   void UpdateGcmChannelState(bool online);
   void UpdateHttpChannelState(bool online);
 
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   std::unique_ptr<GCMNetworkChannelDelegate> delegate_;
 
   // Message is saved until all conditions are met: there is valid
   // registration_id and access_token.
   std::string cached_message_;
 
@@ skipping 20 matching lines @@
   GCMNetworkChannelDiagnostic diagnostic_info_;
 
   base::WeakPtrFactory<GCMNetworkChannel> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMNetworkChannel);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_INVALIDATION_IMPL_GCM_NETWORK_CHANNEL_H_