Disable external/wpt/cors/origin.htm test

Bug: 900701
Change-Id: I75a497a1c2db7eddb925b1269cdbd3c1b4e113e6
Tbr: lukebjerring@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1311253Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604373}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5587,3 +5587,4 @@ crbug.com/900356 [ Win ] virtual/threaded/animations/animationworklet/worklet-an
 # Sheriff 2018-10-31
 crbug.com/900326 [ Win7 Mac10.12 ] http/tests/devtools/network/preview-searchable.js [ Timeout Pass ]
 crbug.com/900641 [ Linux ] compositing/transitions/transform-on-large-layer.html [ Timeout Pass ]
+crbug.com/900703 external/wpt/cors/origin.htm [ Failure Pass ]