[GCM] Wiring heartbeat interval calls to GCMDriver

google_apis/gcm/engine/gcm_store.cc

Index: google_apis/gcm/engine/gcm_store.cc
diff --git a/google_apis/gcm/engine/gcm_store.cc b/google_apis/gcm/engine/gcm_store.cc
index 6f5ab0e3a2d80b0ffda96a950cfa6035123e1df1..c6985286c07ac4339854c4cf6c52333c1c3fff62 100644
--- a/google_apis/gcm/engine/gcm_store.cc
+++ b/google_apis/gcm/engine/gcm_store.cc
@@ -26,6 +26,7 @@ void GCMStore::LoadResult::Reset() {
   last_token_fetch_time = base::Time::FromInternalValue(0LL);
   last_checkin_accounts.clear();
   account_mappings.clear();
+  heartbeat_intervals.clear();
   success = false;
   instance_id_data.clear();
 }