Make media controls not depend on the webkitfullscreenchange event

third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html

Index: third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html
diff --git a/third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html b/third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html
index db1fd28699ff161c5dea61fb878cb91dd5ba0ffa..30fccc14bf5a339a2118e566dcabadfa861a8861 100644
--- a/third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html
+++ b/third_party/WebKit/LayoutTests/media/video-controls-overflow-menu-fullscreen-button.html
@@ -28,9 +28,12 @@ async_test(function(t) {
     var coords = elementCoordinates(overflowList.children[OverflowMenuButtons.FULLSCREEN]);
     clickAtCoordinates(coords[0], coords[1]);
 
-    document.onwebkitfullscreenchange = t.step_func_done(() => {
+    document.onwebkitfullscreenchange = t.step_func(() => {
       assert_equals(document.fullscreenElement, video);
-      assert_equals(getComputedStyle(overflowMenu).display, "none");
+      // Hiding the overflow menu is triggered by layout.
+      testRunner.layoutAndPaintAsyncThen(t.step_func_done(() => {
+        assert_equals(getComputedStyle(overflowMenu).display, "none");
+      }));
     });
   }));
 });