Pass JavaRef to Java methods in device/bluetooth.

device/bluetooth/bluetooth_device_android.cc

Index: device/bluetooth/bluetooth_device_android.cc
diff --git a/device/bluetooth/bluetooth_device_android.cc b/device/bluetooth/bluetooth_device_android.cc
index 3bcd2835b51b4462e04878f9cf8688ece8e61019..a8dc150a5c9fc356734d337809b71dff4bdbf16d 100644
--- a/device/bluetooth/bluetooth_device_android.cc
+++ b/device/bluetooth/bluetooth_device_android.cc
@@ -15,6 +15,7 @@
 
 using base::android::AttachCurrentThread;
 using base::android::JavaParamRef;
+using base::android::JavaRef;
 
 namespace device {
 namespace {
@@ -34,7 +35,8 @@ void RecordConnectionTerminatedResult(int32_t status) {
 
 BluetoothDeviceAndroid* BluetoothDeviceAndroid::Create(
     BluetoothAdapterAndroid* adapter,
-    jobject bluetooth_device_wrapper) {  // Java Type: bluetoothDeviceWrapper
+    const JavaRef<jobject>&
+        bluetooth_device_wrapper) {  // Java Type: bluetoothDeviceWrapper
   BluetoothDeviceAndroid* device = new BluetoothDeviceAndroid(adapter);
 
   device->j_device_.Reset(Java_ChromeBluetoothDevice_create(
@@ -252,7 +254,7 @@ void BluetoothDeviceAndroid::CreateGattRemoteService(
           instance_id_string,
           BluetoothRemoteGattServiceAndroid::Create(
               GetAndroidAdapter(), this, bluetooth_gatt_service_wrapper,
-              instance_id_string, j_device_.obj()));
+              instance_id_string, j_device_));
 
   adapter_->NotifyGattServiceAdded(service_iterator->second);
 }