Always wait for DataReady() on Windows WaveOut.

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 3dae719856508cd6a25e28dc22cd84305a35dd58..762a9483d0fb51d1bdeed0cfa08a042508bab368 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -102,11 +102,7 @@ class MEDIA_EXPORT AudioOutputController
     // Close this synchronous reader.
     virtual void Close() = 0;
 
-    // Poll if data is ready.
-    // Not reliable, as there is no guarantee that renderer is "new-style"
-    // renderer that writes metadata into buffer. After several unsuccessful
-    // attempts caller should assume the data is ready even if that function
-    // returns false.
+    // Check if data is ready.
     virtual bool DataReady() = 0;
   };