Add missing using statements for JNI types.

content/browser/media/session/media_session_delegate_android.cc

 // Copyright 2016 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 "content/browser/media/session/media_session_delegate_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/MediaSessionDelegate_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace content {
 
 // static
 bool MediaSessionDelegateAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 MediaSessionDelegateAndroid::MediaSessionDelegateAndroid(
     MediaSession* media_session)
     : media_session_(media_session) {
@@ skipping 65 matching lines @@
 // static
 std::unique_ptr<MediaSessionDelegate> MediaSessionDelegate::Create(
     MediaSession* media_session) {
   MediaSessionDelegateAndroid* delegate =
       new MediaSessionDelegateAndroid(media_session);
   delegate->Initialize();
   return std::unique_ptr<MediaSessionDelegate>(delegate);
 }
 
 }  // namespace content