Revert of 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 36c198ac62f47568c0fb62f45776f48210adb108..33450a3f23ca17ce1c23cdac0fdbd5ca486ab236 100644
--- a/media/audio/win/audio_low_latency_output_win.cc
+++ b/media/audio/win/audio_low_latency_output_win.cc
@@ -281,6 +281,12 @@
       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();
@@ -628,9 +634,11 @@
 
 void WASAPIAudioOutputStream::StopThread() {
   if (render_thread_) {
-    // Wait until the thread completes and perform cleanup.
-    SetEvent(stop_render_event_.Get());
-    render_thread_->Join();
+    if (render_thread_->HasBeenStarted()) {
+      // Wait until the thread completes and perform cleanup.
+      SetEvent(stop_render_event_.Get());
+      render_thread_->Join();
+    }
 
     render_thread_.reset();