[reland] Do not block in SimpleThread::Start().

media/audio/win/audio_low_latency_output_win.cc

Index: media/audio/win/audio_low_latency_output_win.cc
diff --git a/media/audio/win/audio_low_latency_output_win.cc b/media/audio/win/audio_low_latency_output_win.cc
index 3dbb7d6b0b559e8c9fc61ea602857818c6b0929c..8ad7f79d9d26ee427870f5b7c2780b829ca01fda 100644
--- a/media/audio/win/audio_low_latency_output_win.cc
+++ b/media/audio/win/audio_low_latency_output_win.cc
@@ -281,12 +281,6 @@ void WASAPIAudioOutputStream::Start(AudioSourceCallback* callback) {
       this, "wasapi_render_thread",
       base::SimpleThread::Options(base::ThreadPriority::REALTIME_AUDIO)));
   render_thread_->Start();
-  if (!render_thread_->HasBeenStarted()) {
-    LOG(ERROR) << "Failed to start WASAPI render thread.";
-    StopThread();
-    callback->OnError(this);
-    return;
-  }
 
   // Start streaming data between the endpoint buffer and the audio engine.
   HRESULT hr = audio_client_->Start();
@@ -639,11 +633,9 @@ HRESULT WASAPIAudioOutputStream::ExclusiveModeInitialization(
 
 void WASAPIAudioOutputStream::StopThread() {
   if (render_thread_) {
-    if (render_thread_->HasBeenStarted()) {
-      // Wait until the thread completes and perform cleanup.
-      SetEvent(stop_render_event_.Get());
-      render_thread_->Join();
-    }
+    // Wait until the thread completes and perform cleanup.
+    SetEvent(stop_render_event_.Get());
+    render_thread_->Join();
 
     render_thread_.reset();