[Sync] Fixing sync_driver lint violations and adding PRESUBMIT lint check.

components/sync_driver/sync_prefs_unittest.cc

 // Copyright (c) 2012 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 "components/sync_driver/sync_prefs.h"
 
+#include <map>
+
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_value_store.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/time/time.h"
 #include "components/pref_registry/testing_pref_service_syncable.h"
 #include "components/sync_driver/pref_names.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 235 matching lines @@
 
   EXPECT_EQ(versions.size(), versions2.size());
   for (auto map_iter : versions2) {
     EXPECT_EQ(versions[map_iter.first], map_iter.second);
   }
 }
 
 }  // namespace
 
 }  // namespace sync_driver