Remove unnecessary refreshCastButtonVisibility call

third_party/WebKit/LayoutTests/media/media-controls.js

 var captionsButtonElement;
 var captionsButtonCoordinates;
 
 // As specified in mediaControls.css, this is how long it takes to fade out controls
 const controlsFadeOutDurationMs = 300;
 
 // The timeout for the hide-after-no-mouse-movement behavior. Defined (and
 // should mirror) the value 'timeWithoutMouseMovementBeforeHidingMediaControls'
 // in MediaControls.cpp.
 const controlsMouseMovementTimeoutMs = 3000;
 
+function castButton(videoElement) {
+    var controlID = '-internal-media-controls-cast-button';
+    var button = mediaControlsElement(window.internals.shadowRoot(videoElement).firstChild, controlID);
+    if (!button)
+        throw 'Failed to find cast button';
+    return button;
+}
+
 function overlayCastButton(videoElement)
 {
     var controlID = '-internal-media-controls-overlay-cast-button';
     var button = mediaControlsElement(window.internals.shadowRoot(videoElement).firstChild, controlID);
     if (!button)
         throw 'Failed to find cast button';
     return button;
 }
 
 function mediaControlsElement(first, id)
@@ skipping 175 matching lines @@
 function hasFullscreenButton(element)
 {
     var size = mediaControlsButtonDimensions(element, "fullscreen-button");
     return size[0] > 0 && size[1] > 0;
 }
 
 function isControlsPanelVisible(element)
 {
     return getComputedStyle(mediaControlsButton(element, "panel")).opacity == "1";
 }