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It was the case that if ResetForCrossDocumentRestart is called before
committing, OnCommitTimeout was called which crashed when trying to get
the current RenderFrameHost.

The introduced test failed with the same stack trace in the related bug
before resetting commit timeout.

Bug: 1006677
Change-Id: Ia1d08f792cbd9c3692533d69519cb6da7e21d102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879913
Commit-Queue: Mohamed Abdelhalim <zetamoo@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709984}