[Origin Policy] Change request header default to "0".

Change the client header announcing OP capability to use the value "0". This
is meant to mitigate an apparently reasonably common bug where the header value
is blindly copied into the request (as observed in the referenced bug).

Bug: 751996, 901477
Change-Id: I85c67cfdad3d15fc8e76e62bf1f84323faa1f790
Reviewed-on: https://chromium-review.googlesource.com/c/1328982
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#607246}(cherry picked from commit 5421fc28c90bd861efe078b397cc14af008fed78)
Reviewed-on: https://chromium-review.googlesource.com/c/1338103
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#690}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
2 files changed