# Disable Google Cloud Messaging (GCM) client

--- a/components/gcm_driver/gcm_client_impl.cc
+++ b/components/gcm_driver/gcm_client_impl.cc
@@ -497,6 +497,7 @@
 }
 
 void GCMClientImpl::InitializeMCSClient() {
+  return;
   DCHECK(network_connection_tracker_);
   std::vector<GURL> endpoints;
   endpoints.push_back(gservices_settings_.GetMCSMainEndpoint());
@@ -678,6 +679,7 @@
 }
 
 void GCMClientImpl::StartCheckin() {
+  return;
   // Make sure no checkin is in progress.
   if (checkin_request_.get())
     return;
@@ -756,6 +758,7 @@
 }
 
 void GCMClientImpl::SchedulePeriodicCheckin() {
+  return;
   // Make sure no checkin is in progress.
   if (checkin_request_.get() || !device_checkin_info_.accounts_set)
     return;