jni: Pass method parameters as JavaParamRef in content.

content/browser/media/android/media_session.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 CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_
 #define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 44 matching lines @@
   // Removes the given player from the current media session. Abandons audio
   // focus if that was the last player in the session.
   void RemovePlayer(MediaSessionObserver* observer, int player_id);
 
   // Removes all the players associated with |observer|. Abandons audio focus if
   // these were the last players in the session.
   void RemovePlayers(MediaSessionObserver* observer);
 
   // Called when the Android system requests the MediaSession to be suspended.
   // Called by Java through JNI.
-  void OnSuspend(JNIEnv* env, jobject obj, jboolean temporary);
+  void OnSuspend(JNIEnv* env,
+                 const base::android::JavaParamRef<jobject>& obj,
+                 jboolean temporary);
 
   // Called when the Android system requests the MediaSession to be resumed.
   // Called by Java through JNI.
-  void OnResume(JNIEnv* env, jobject obj);
+  void OnResume(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   // Called when the user requests resuming the session. No-op if the session is
   // not controllable.
   void Resume();
 
   // Called when the user requests suspending the session. No-op if the session
   // is not controllable.
   void Suspend();
 
   // Called when the user requests stopping the session.
@@ skipping 81 matching lines @@
   Type audio_focus_type_;
 
   MediaSessionUmaHelper uma_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSession);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_