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This means we will no longer need to maintain the exec script
whitelist in two places for ANGLE (in Chrome and ANGLE itself).

Tbr: dpranke@chromium.org
Bug: angleproject:2339
Change-Id: I4ad9d2d4a66cbfeb2245785c07839489a7e4ad58
Reviewed-on: https://chromium-review.googlesource.com/902197Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534770}