[GCM] Only allow the senders that the application is currently registered for

chrome/browser/services/gcm/gcm_profile_service.cc

Index: chrome/browser/services/gcm/gcm_profile_service.cc
diff --git a/chrome/browser/services/gcm/gcm_profile_service.cc b/chrome/browser/services/gcm/gcm_profile_service.cc
index ec5e0950cc02ee42b535cd77b0027c1cc6fb15f9..a0a9a56ad2fe4e981faeb8f6b35001059d17f79e 100644
--- a/chrome/browser/services/gcm/gcm_profile_service.cc
+++ b/chrome/browser/services/gcm/gcm_profile_service.cc
@@ -906,6 +906,12 @@ void GCMProfileService::MessageReceived(const std::string& app_id,
   if (username_.empty())
     return;
 
+  RegistrationInfoMap::iterator iter = registration_info_map_.find(app_id);
+  if (iter == registration_info_map_.end() ||
+      iter->second.sender_id != message.sender_id) {
+    return;
+  }
+
   GetEventRouter(app_id)->OnMessage(app_id, message);
 }