Remove implicit conversions from scoped_refptr to T* in media/

media/audio/audio_device_thread.cc

Index: media/audio/audio_device_thread.cc
diff --git a/media/audio/audio_device_thread.cc b/media/audio/audio_device_thread.cc
index daf908556d8edf221f61fda6d4cd38fc41d9fbd2..b8ae3f903196320800c25bf176bae17ec382c21e 100644
--- a/media/audio/audio_device_thread.cc
+++ b/media/audio/audio_device_thread.cc
@@ -72,7 +72,7 @@ void AudioDeviceThread::Start(AudioDeviceThread::Callback* callback,
                               const char* thread_name,
                               bool synchronized_buffers) {
   base::AutoLock auto_lock(thread_lock_);
-  CHECK(!thread_);
+  CHECK(!thread_.get());
   thread_ = new AudioDeviceThread::Thread(
       callback, socket, thread_name, synchronized_buffers);
   thread_->Start();
@@ -88,7 +88,7 @@ void AudioDeviceThread::Stop(base::MessageLoop* loop_for_join) {
 
 bool AudioDeviceThread::IsStopped() {
   base::AutoLock auto_lock(thread_lock_);
-  return !thread_;
+  return !thread_.get();
 }
 
 // AudioDeviceThread::Thread implementation