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Note that this is a speculative fix as I was unable to repro, but see
the bug for context - I'm pretty certain this will fix the crash.

This introduces NavigationController::RemoveForwardEntries which will
attempt to remove any forward navigation entries (without crashing :)).

Bug: 963783
Change-Id: Ic375e0e4fd89d4ded3a5229bf82ccb932e10ab5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775070
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699046}