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This is a reland of bbd8d150, now that the
peer-component's implementation of the UrlRequestRewriteRulesProvider really
actually works correctly!

Original change's description:
> [fuchsia] Handle UrlRequestRewriteRulesProvider in CastRunner.
>
> * 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}

TBR=fdegans

Bug: 976975, b/141305604
Change-Id: I5e96abb44c167e64c2dbb32b596a6ce4550f61b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820198Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699164}