Do not create GCM store if it is not needed

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 c6985286c07ac4339854c4cf6c52333c1c3fff62..a1871b952bb1da2cdc02c63286b7f0c614071402 100644
--- a/google_apis/gcm/engine/gcm_store.cc
+++ b/google_apis/gcm/engine/gcm_store.cc
@@ -8,6 +8,7 @@ namespace gcm {
 
 GCMStore::LoadResult::LoadResult()
     : success(false),
+      store_does_not_exist(false),
       device_android_id(0),
       device_security_token(0) {
 }
@@ -28,6 +29,7 @@ void GCMStore::LoadResult::Reset() {
   account_mappings.clear();
   heartbeat_intervals.clear();
   success = false;
+  store_does_not_exist = false;
   instance_id_data.clear();
 }