Change audio render thread checking to use new AudioRendererSink::BelongsToRendererThread()

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 20874599e68f5f7cfddeff0022291e64aa718b6c..4cbe9a5d2e18c80a5ae4eaf56e1a819f06c094d0 100644
--- a/media/audio/audio_device_thread.cc
+++ b/media/audio/audio_device_thread.cc
@@ -230,11 +230,16 @@ AudioDeviceThread::Callback::Callback(const AudioParameters& audio_parameters,
   CHECK_GT(total_segments_, 0);
   CHECK_EQ(memory_length_ % total_segments_, 0);
   segment_length_ = memory_length_ / total_segments_;
+  thread_checker_.DetachFromThread();
 }
 
 AudioDeviceThread::Callback::~Callback() {}
 
 void AudioDeviceThread::Callback::InitializeOnAudioThread() {
+  // Normally this function is called before the thread checker is used
+  // elsewhere, but it's not guaranteed. DCHECK to ensure it was not used on
+  // another thread before we get here.
+  DCHECK(thread_checker_.CalledOnValidThread());
   MapSharedMemory();
   CHECK(shared_memory_.memory());
 }