Make GetApplicationContext return a JavaRef.

media/capture/video/android/video_capture_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/capture/video/android/video_capture_device_factory_android.h"
 
 #include <utility>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "jni/VideoCaptureFactory_jni.h"
 #include "media/capture/video/android/video_capture_device_android.h"
 
 using base::android::AttachCurrentThread;
+using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace media {
 
 // static
 ScopedJavaLocalRef<jobject>
 VideoCaptureDeviceFactoryAndroid::createVideoCaptureAndroid(
     int id,
     jlong nativeVideoCaptureDeviceAndroid) {
   return (Java_VideoCaptureFactory_createVideoCapture(
@@ skipping 19 matching lines @@
   return std::unique_ptr<VideoCaptureDevice>();
 }
 
 void VideoCaptureDeviceFactoryAndroid::GetDeviceDescriptors(
     VideoCaptureDeviceDescriptors* device_descriptors) {
   DCHECK(thread_checker_.CalledOnValidThread());
   device_descriptors->clear();
 
   JNIEnv* env = AttachCurrentThread();
 
-  const jobject context = base::android::GetApplicationContext();
+  const JavaRef<jobject>& context = base::android::GetApplicationContext();
   const int num_cameras =
       Java_VideoCaptureFactory_getNumberOfCameras(env, context);
   DVLOG(1) << __FUNCTION__ << ": num_cameras=" << num_cameras;
   if (num_cameras <= 0)
     return;
 
   for (int camera_id = num_cameras - 1; camera_id >= 0; --camera_id) {
     base::android::ScopedJavaLocalRef<jstring> device_name =
         Java_VideoCaptureFactory_getDeviceName(env, camera_id, context);
     if (device_name.obj() == NULL)
@@ skipping 64 matching lines @@
 }
 
 // static
 VideoCaptureDeviceFactory*
 VideoCaptureDeviceFactory::CreateVideoCaptureDeviceFactory(
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
   return new VideoCaptureDeviceFactoryAndroid();
 }
 
 }  // namespace media