Do not use overlays when VR shell is enabled.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index d1c5da6018df1df2fa69e92ac0a6002150f6e3ba..da8fc8f3c265c18478dd9cb23c5148e968819fad 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2857,6 +2857,13 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
       GetWebMediaPlayerDelegate()->AsWeakPtr(),
       std::move(media_renderer_factory), url_index_, params);
 
+  // TODO(http://crbug.com/673886): Re-enable overlays with VR shell enabled
+  // when VR shell's video reprojection surface is enabled. Remove the setter
+  // and put the overlay feature check back in the constructor at that time.
+  media_player->SetEnableFullscreenOverlays(
+      base::FeatureList::IsEnabled(media::kOverlayFullscreenVideo) &&
+      !base::FeatureList::IsEnabled(features::kVrShell));
+
 #if defined(OS_ANDROID)  // WMPI_CAST
   media_player->SetMediaPlayerManager(GetMediaPlayerManager());
   media_player->SetDeviceScaleFactor(render_view_->GetDeviceScaleFactor());