Use a direct include of strings headers in crypto/, dbus/, device/.

device/bluetooth/bluetooth_profile_experimental_chromeos.cc

 // Copyright (c) 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 "device/bluetooth/bluetooth_profile_experimental_chromeos.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/task_runner_util.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/worker_pool.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/experimental_bluetooth_profile_manager_client.h"
 #include "chromeos/dbus/experimental_bluetooth_profile_service_provider.h"
 #include "dbus/bus.h"
 #include "dbus/file_descriptor.h"
 #include "dbus/object_path.h"
 #include "device/bluetooth/bluetooth_adapter_experimental_chromeos.h"
@@ skipping 223 matching lines @@
       static_cast<BluetoothAdapterExperimentalChromeOS*>(adapter.get())->
           GetDeviceWithPath(device_path);
   DCHECK(device);
 
   scoped_refptr<BluetoothSocket> socket((
       BluetoothSocketExperimentalChromeOS::Create(fd.get())));
   connection_callback_.Run(device, socket);
 }
 
 }  // namespace chromeos