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As of CL 1838592, -webkit-mask-image now uses CORS-enabled loading,
blocking chrome:// pages from using chrome://theme resources as mask
images. This only applies to OOBE and the WebUI tab strip currently.

Change-Id: I10f8a0e68ff2de4603a7bbb816c1f1c4a42b76e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855182Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705596}