Don't show media controls when there is a persistent video.

third_party/WebKit/Source/core/html/shadow/MediaControls.h

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.h b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
index b2046b6cbf97cd441b9544e5aaa4bb1c7126c58c..74805310d50a486754080001c24d9494b9eecfb0 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
@@ -110,6 +110,13 @@ class CORE_EXPORT MediaControls final : public HTMLDivElement {
     refreshCastButtonVisibility();
   }
 
+  // TODO(mlamouri): this method is needed in order to notify the controls that
+  // the `mediaControlsEnabled` setting has changed.
+  void onMediaControlsEnabledChange() {
+    // There is no update because only the overlay is expected to change.
+    refreshCastButtonVisibilityWithoutUpdate();
+  }
+
   DECLARE_VIRTUAL_TRACE();
 
  private: