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We cannot retry anything yet, so make sure the renderer knows we're
gone.

Drive-by remove handling of navigations, since it was crashing.

Bug: 787806, 840345
Change-Id: Icbaf49dda9ca12094ada2e9decc57622cd1feff6
Reviewed-on: https://chromium-review.googlesource.com/1047209
Commit-Queue: Max Morin <maxmorin@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557491}