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

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

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
index 89f8b67ed7531bd47f8619d88d91b4e59aeef7df..106a1c46a46a3ca02047ce089a728d38ee00c624 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
@@ -532,7 +532,10 @@ void MediaControls::refreshCastButtonVisibilityWithoutUpdate() {
     // non-cast changes (e.g., resize) occur.  If the panel button
     // is shown, however, compute...() will take control of the
     // overlay cast button if it needs to hide it from the panel.
-    m_overlayCastButton->tryShowOverlay();
+    if (!document().settings() ||
+        !document().settings()->getMediaControlsEnabled()) {
+      m_overlayCastButton->tryShowOverlay();
+    }
     m_castButton->setIsWanted(false);
   } else if (mediaElement().shouldShowControls()) {
     m_overlayCastButton->setIsWanted(false);