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

components/gcm_driver/gcm_account_mapper.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_GCM_DRIVER_GCM_ACCOUNT_MAPPER_H_
 #define COMPONENTS_GCM_DRIVER_GCM_ACCOUNT_MAPPER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 29 matching lines @@
   void Initialize(const AccountMappings& account_mappings,
                   const DispatchMessageCallback& callback);
 
   // Called by AccountTracker, when a new list of account tokens is available.
   // This will cause a refresh of account mappings and sending updates to GCM.
   void SetAccountTokens(
       const std::vector<GCMClient::AccountTokenInfo>& account_tokens);
 
   // Implementation of GCMAppHandler:
   void ShutdownHandler() override;
+  void OnStoreReset() override;
   void OnMessage(const std::string& app_id,
                  const IncomingMessage& message) override;
   void OnMessagesDeleted(const std::string& app_id) override;
   void OnSendError(
       const std::string& app_id,
       const GCMClient::SendErrorDetails& send_error_details) override;
   void OnSendAcknowledged(const std::string& app_id,
                           const std::string& message_id) override;
   bool CanHandle(const std::string& app_id) const override;
 
@@ skipping 64 matching lines @@
   bool initialized_;
 
   base::WeakPtrFactory<GCMAccountMapper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMAccountMapper);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_ACCOUNT_MAPPER_H_