Use a direct include of strings headers in chrome/browser/chromeos/.

chrome/browser/chromeos/contacts/gdata_contacts_service.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 "chrome/browser/chromeos/contacts/gdata_contacts_service.h"
 
 #include <cstring>
 #include <map>
 #include <string>
 #include <utility>
 
 #include "base/json/json_value_converter.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/contacts/contact.pb.h"
 #include "chrome/browser/google_apis/gdata_contacts_requests.h"
 #include "chrome/browser/google_apis/gdata_errorcode.h"
 #include "chrome/browser/google_apis/request_sender.h"
 #include "chrome/browser/google_apis/time_util.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 876 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(request);
   VLOG(1) << "Download request " << request << " complete";
   if (!request->my_contacts_group_id().empty())
     cached_my_contacts_group_id_ = request->my_contacts_group_id();
   requests_.erase(request);
   delete request;
 }
 
 }  // namespace contacts