[GCM] Remove the requirement for manifest key

google_apis/gcm/gcm_client_impl.cc

Index: google_apis/gcm/gcm_client_impl.cc
diff --git a/google_apis/gcm/gcm_client_impl.cc b/google_apis/gcm/gcm_client_impl.cc
index 46b246d3a4baa06ae65b422acd2cf8382f3d73f6..2a48f20b2e99fc8b8e8864cf898406e718477dd1 100644
--- a/google_apis/gcm/gcm_client_impl.cc
+++ b/google_apis/gcm/gcm_client_impl.cc
@@ -297,14 +297,12 @@ void GCMClientImpl::CheckOut() {
 }
 
 void GCMClientImpl::Register(const std::string& app_id,
-                             const std::string& cert,
                              const std::vector<std::string>& sender_ids) {
   DCHECK_EQ(state_, READY);
   RegistrationRequest::RequestInfo request_info(
       device_checkin_info_.android_id,
       device_checkin_info_.secret,
       app_id,
-      cert,
       sender_ids);
   DCHECK_EQ(0u, pending_registrations_.count(app_id));