Make GetApplicationContext return a JavaRef.

media/base/android/media_player_android.cc

 // Copyright (c) 2013 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/base/android/media_player_android.h"
 
 #include <algorithm>
 
 #include "base/android/context_utils.h"
+#include "base/android/scoped_java_ref.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/android/media_drm_bridge.h"
 #include "media/base/android/media_player_manager.h"
 
+using base::android::JavaRef;
+
 namespace {
 
 const double kDefaultVolume = 1.0;
 
 }  // namespace
 
 namespace media {
 
 const double MediaPlayerAndroid::kDefaultVolumeMultiplier = 1.0;
 
@@ skipping 73 matching lines @@
 void MediaPlayerAndroid::OnMediaInterrupted() {
   manager_->OnMediaInterrupted(player_id());
 }
 
 void MediaPlayerAndroid::OnSeekComplete() {
   manager_->OnSeekComplete(player_id(), GetCurrentTime());
 }
 
 void MediaPlayerAndroid::OnMediaPrepared() {}
 
-void MediaPlayerAndroid::AttachListener(jobject j_media_player) {
-  jobject j_context = base::android::GetApplicationContext();
-  DCHECK(j_context);
-
-  listener_->CreateMediaPlayerListener(j_context, j_media_player);
+void MediaPlayerAndroid::AttachListener(
+    const JavaRef<jobject>& j_media_player) {
+  listener_->CreateMediaPlayerListener(base::android::GetApplicationContext(),
+                                       j_media_player);
 }
 
 void MediaPlayerAndroid::DetachListener() {
   listener_->ReleaseMediaPlayerListenerResources();
 }
 
 void MediaPlayerAndroid::DestroyListenerOnUIThread() {
   weak_factory_.InvalidateWeakPtrs();
   listener_.reset();
 }
 
 base::WeakPtr<MediaPlayerAndroid> MediaPlayerAndroid::WeakPtrForUIThread() {
   return weak_factory_.GetWeakPtr();
 }
 
 }  // namespace media