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* Implement handling of the
  chromium.cast.UrlRequestRewriteRulesProvider API in CastRunner.
* Remove handling of the fuchsia.web.AdditionalHeadersProvider API in
  CastRunner as it is deprecated.
* Adapt the integration test to use the new API.

Bug: 976975
Change-Id: If1e97c474f79a4b6f3f0c03428b85557e3e73460
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1770434
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695766}