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

device/bluetooth/test/mock_bluetooth_device.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 DEVICE_BLUETOOTH_TEST_MOCK_BLUETOOTH_DEVICE_H_
 #define DEVICE_BLUETOOTH_TEST_MOCK_BLUETOOTH_DEVICE_H_
 
 #include <string>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_out_of_band_pairing_data.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace device {
 
 class MockBluetoothAdapter;
 
 class MockBluetoothDevice : public BluetoothDevice {
  public:
@@ skipping 61 matching lines @@
  private:
   uint32 bluetooth_class_;
   std::string name_;
   std::string address_;
   BluetoothDevice::ServiceList service_list_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_TEST_MOCK_BLUETOOTH_DEVICE_H_