Mark CORS Test as Timeout

TBR=jdoerrie@chromium.org

Bug: 746926
Change-Id: I888ae3eddd83ac589a6430bd9b3355d97d14b825
Reviewed-on: https://chromium-review.googlesource.com/579387Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488216}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3102,3 +3102,6 @@ crbug.com/626703 [ Win7 ] external/wpt/html/syntax/parsing/html5lib_tests16.html
 crbug.com/746128 [ Win7 ] media/controls/video-enter-exit-fullscreen-without-hovering-doesnt-show-controls.html [ Failure ]
 
 crbug.com/626703 [ Win7 ] external/wpt/image-decodes/image-decode-path-changes.html [ Pass Crash ]
+
+# Sheriff failures 2017-07-20
+crbug.com/746926 [ Win Debug ] virtual/outofblink-cors/webexposed/global-interface-listing.html [ Timeout ]