Add missing using statements for JNI types.

media/midi/usb_midi_device_factory_android.cc

 // Copyright 2014 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 "media/midi/usb_midi_device_factory_android.h"
 
 #include <stddef.h>
 
 #include "base/android/context_utils.h"
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/lock.h"
 #include "jni/UsbMidiDeviceFactoryAndroid_jni.h"
 #include "media/midi/usb_midi_device_android.h"
 
+using base::android::JavaParamRef;
+
 namespace media {
 namespace midi {
 
 namespace {
 
 using Callback = UsbMidiDevice::Factory::Callback;
 
 }  // namespace
 
 UsbMidiDeviceFactoryAndroid::UsbMidiDeviceFactoryAndroid() : delegate_(NULL) {}
@@ skipping 59 matching lines @@
     jint index) {
   delegate_->OnDeviceDetached(index);
 }
 
 bool UsbMidiDeviceFactoryAndroid::RegisterUsbMidiDeviceFactory(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace midi
 }  // namespace media