[GCM] API update to allow only a single sender in registration

google_apis/gcm/gcm_client_impl.h

 // Copyright 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 GOOGLE_APIS_GCM_GCM_CLIENT_IMPL_H_
 #define GOOGLE_APIS_GCM_GCM_CLIENT_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 41 matching lines @@
       const base::FilePath& store_path,
       const std::vector<std::string>& account_ids,
       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
       const scoped_refptr<net::URLRequestContextGetter>&
           url_request_context_getter,
       Delegate* delegate) OVERRIDE;
   virtual void Load() OVERRIDE;
   virtual void CheckOut() OVERRIDE;
   virtual void Register(const std::string& app_id,
                         const std::string& cert,
-                        const std::vector<std::string>& sender_ids) OVERRIDE;
+                        const std::string& sender_id) OVERRIDE;
   virtual void Unregister(const std::string& app_id) OVERRIDE;
   virtual void Send(const std::string& app_id,
                     const std::string& receiver_id,
                     const OutgoingMessage& message) OVERRIDE;
 
  private:
   // State representation of the GCMClient.
   enum State {
     // Uninitialized.
     UNINITIALIZED,
@@ skipping 142 matching lines @@
 
   // Factory for creating references in callbacks.
   base::WeakPtrFactory<GCMClientImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMClientImpl);
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_GCM_CLIENT_IMPL_H_