CSP handling of 'self' inside sandbox iframe was incorrect. #17326
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The correct handling of 'self' depended on the timing of when the
ExecutionContext's sandbox flags were applied. If a CSP policy for 'self'
was applied after the origin was derived to be opaque it would fail.
BUG=973991
Change-Id: Ie6f384b02aa3dea3ce48c3052f06b7bd8fb2d3ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658764
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670074}