Fix a crash when setting MediaControlsEnabled setting for videos without controls

third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html

Index: third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html
diff --git a/third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html b/third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html
index 5bd7c1153b9c6336874176f480d5a99156bb40fa..2aac53bc4cacfdbd8a94bb46d3e99f37f62912e7 100644
--- a/third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html
+++ b/third_party/WebKit/LayoutTests/media/controls/settings-disable-controls.html
@@ -6,6 +6,11 @@
 <script src="../media-controls.js"></script>
 <video controls></video>
 <script>
+// |orphanedVideo| is used to check that the setting should not be despatched
+// if the MediaControls of a video haven't been initialized.
+var orphanedVideo = document.createElement('video');
+orphanedVideo.controls = true;
+
 async_test(t => {
   var video = document.querySelector('video');