Pass JavaRef to Java methods in device/bluetooth.

device/bluetooth/bluetooth_adapter_android.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/jni_android.h"
@@ skipping 26 matching lines @@
     : public BluetoothAdapter {
  public:
   // Create a BluetoothAdapterAndroid instance.
   //
   // |java_bluetooth_adapter_wrapper| is optional. If it is NULL the adapter
   // will return false for |IsPresent()| and not be functional.
   //
   // The BluetoothAdapterAndroid instance will indirectly hold a Java reference
   // to |bluetooth_adapter_wrapper|.
   static base::WeakPtr<BluetoothAdapterAndroid> Create(
-      jobject bluetooth_adapter_wrapper);  // Java Type: bluetoothAdapterWrapper
+      const base::android::JavaRef<jobject>&
+          bluetooth_adapter_wrapper);  // Java Type: bluetoothAdapterWrapper
 
   // Register C++ methods exposed to Java using JNI.
   static bool RegisterJNI(JNIEnv* env);
 
   // BluetoothAdapter:
   std::string GetAddress() const override;
   std::string GetName() const override;
   void SetName(const std::string& name,
                const base::Closure& callback,
                const ErrorCallback& error_callback) override;
@@ skipping 85 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterAndroid);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_