Fix test transferToImageBitmap-empty.html after r253099
Created attachment 387102 [details] Patch
The test http/wpt/offscreen-canvas/transferToImageBitmap-empty.html is failing since r253099. According to https://html.spec.whatwg.org/multipage/canvas.html#dom-offscreencanvas-transfertoimagebitmap, transferToImageBitmap should return InvalidStateError if there's no context. r253099 implemented such behavior. The test should be updated.
Comment on attachment 387102 [details] Patch Clearing flags on attachment: 387102 Committed r254253: <https://trac.webkit.org/changeset/254253>
All reviewed patches have been landed. Closing bug.
<rdar://problem/58435498>