Enforce no mojom::FetchRequestMode::kNavigate from renderer processes.

Bug: 953315
Change-Id: I211289d620b62488d53ba3ccbe65e6805008fde5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574144
Commit-Queue: Ɓukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#654060}
8 files changed