Add missing using statements for JNI types.

device/bluetooth/android/wrappers.cc

 // Copyright 2015 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/android/wrappers.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/Wrappers_jni.h"
 
 using base::android::AttachCurrentThread;
+using base::android::ScopedJavaLocalRef;
 
 namespace device {
 
 ScopedJavaLocalRef<jobject> BluetoothAdapterWrapper_CreateWithDefaultAdapter() {
   return Java_BluetoothAdapterWrapper_createWithDefaultAdapter(
       AttachCurrentThread(), base::android::GetApplicationContext());
 }
 
 }  // namespace device