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

chrome/browser/extensions/api/gcm/gcm_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/gcm/gcm_api.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
@@ skipping 111 matching lines @@
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   if (GetExtension()->public_key().empty()) {
     CompleteFunctionWithResult(std::string(),
                                gcm::GCMClient::CERTIFICATE_MISSING);
     return false;
   }
 
   GCMProfileService()->Register(
       GetExtension()->id(),
-      params->sender_ids,
+      params->sender_id,
       SHA1HashHexString(GetExtension()->public_key()),
       base::Bind(&GcmRegisterFunction::CompleteFunctionWithResult, this));
 
   return true;
 }
 
 void GcmRegisterFunction::CompleteFunctionWithResult(
     const std::string& registration_id,
     gcm::GCMClient::Result result) {
   SetResult(base::Value::CreateStringValue(registration_id));
@@ skipping 90 matching lines @@
 
   scoped_ptr<Event> event(new Event(
       api::gcm::OnSendError::kEventName,
       api::gcm::OnSendError::Create(error).Pass(),
       profile_));
   ExtensionSystem::Get(profile_)->event_router()->DispatchEventToExtension(
       app_id, event.Pass());
 }
 
 }  // namespace extensions