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This reverts commit c6df4d27.

Reason for revert: Broke Fuchsia browsertests.
Bug: 925574

Original change's description:
> [Fuchsia] Implement extra headers support in NavigationController.
> 
> This implements setting and using the |headers| data in
> LoadUrlParams. A new test fixture is added to ensure the extra headers
> are properly received by the test server.
> 
> Bug: 923598
> Change-Id: I59a44c886f1853bbc631ae016b0655dd1d4d539b
> Reviewed-on: https://chromium-review.googlesource.com/c/1427565
> Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#625912}

TBR=wez@chromium.org,kmarshall@chromium.org,fdegans@chromium.org

Change-Id: I82c9a5dead06edd58553a0999b708c6cc8b8dfd7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 923598
Reviewed-on: https://chromium-review.googlesource.com/c/1437914Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626277}