Do not create GCM store if it is not needed

google_apis/gcm/engine/mcs_client_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "google_apis/gcm/engine/mcs_client.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 180 matching lines @@
       temp_directory_.path(),
       message_loop_.message_loop_proxy(),
       make_scoped_ptr<Encryptor>(new FakeEncryptor)));
   mcs_client_.reset(new TestMCSClient(&clock_,
                                       &connection_factory_,
                                       gcm_store_.get(),
                                       &recorder_));
 }
 
 void MCSClientTest::InitializeClient() {
-  gcm_store_->Load(base::Bind(
+  gcm_store_->Load(GCMStore::CREATE_IF_MISSING, base::Bind(
       &MCSClient::Initialize,
       base::Unretained(mcs_client_.get()),
       base::Bind(&MCSClientTest::ErrorCallback,
                  base::Unretained(this)),
       base::Bind(&MCSClientTest::MessageReceivedCallback,
                  base::Unretained(this)),
       base::Bind(&MCSClientTest::MessageSentCallback, base::Unretained(this))));
   run_loop_->RunUntilIdle();
   run_loop_.reset(new base::RunLoop());
 }
@@ skipping 959 matching lines @@
 
   // HB manger uses the shortest persisted interval after restart.
   hb_manager = mcs_client()->GetHeartbeatManagerForTesting();
   EXPECT_TRUE(hb_manager->HasClientHeartbeatInterval());
   EXPECT_EQ(interval_ms, hb_manager->GetClientHeartbeatIntervalMs());
 }
 
 } // namespace
 
 }  // namespace gcm