[Sync] Fixing easy lint violations.

chrome/browser/sync/glue/extensions_activity_monitor_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 "chrome/browser/sync/glue/extensions_activity_monitor.h"
 
 #include <stdint.h>
 
+#include <string>
+
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/bookmarks/bookmarks_api.h"
 #include "chrome/common/chrome_paths.h"
 #include "components/sync/base/extensions_activity.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ skipping 147 matching lines @@
   FireBookmarksApiEvent<extensions::BookmarksCreateFunction>(extension1_, 3);
   monitor_.GetExtensionsActivity()->GetAndClearRecords(&results);
 
   EXPECT_EQ(1U, results.size());
   EXPECT_EQ(3U, results[id1_].bookmark_write_count);
 }
 
 }  // namespace
 
 }  // namespace browser_sync