Use a direct include of strings headers in chrome/browser/a*-c*/.

chrome/browser/chrome_to_mobile_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_TO_MOBILE_SERVICE_H_
 #define CHROME_BROWSER_CHROME_TO_MOBILE_SERVICE_H_
 
 #include <map>
 #include <queue>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/timer.h"
 #include "base/values.h"
 #include "chrome/browser/sessions/session_id.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "google_apis/gaia/oauth2_access_token_consumer.h"
 #include "googleurl/src/gurl.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "sync/notifier/invalidation_handler.h"
@@ skipping 199 matching lines @@
   base::OneShotTimer<ChromeToMobileService> auth_retry_timer_;
   base::OneShotTimer<ChromeToMobileService> search_retry_timer_;
 
   // A queue of tasks to perform after an access token is lazily initialized.
   std::queue<base::Closure> task_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeToMobileService);
 };
 
 #endif  // CHROME_BROWSER_CHROME_TO_MOBILE_SERVICE_H_