Add missing using statements for JNI types.

media/midi/midi_manager_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/midi_manager_android.h"
 
 #include "base/android/build_info.h"
 #include "base/android/context_utils.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "jni/MidiManagerAndroid_jni.h"
 #include "media/midi/midi_device_android.h"
 #include "media/midi/midi_manager_usb.h"
 #include "media/midi/midi_output_port_android.h"
 #include "media/midi/midi_switches.h"
 #include "media/midi/usb_midi_device_factory_android.h"
 
+using base::android::JavaParamRef;
+
 namespace media {
 namespace midi {
 
 MidiManager* MidiManager::Create() {
   auto sdk_version = base::android::BuildInfo::GetInstance()->sdk_int();
   if (sdk_version <= base::android::SDK_VERSION_LOLLIPOP_MR1 ||
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUseAndroidMidiApi)) {
     return new MidiManagerUsb(std::unique_ptr<UsbMidiDevice::Factory>(
         new UsbMidiDeviceFactoryAndroid));
@@ skipping 130 matching lines @@
   }
   devices_.push_back(device.release());
 }
 
 bool MidiManagerAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace midi
 }  // namespace media