Bugfix to kill main frame process upon detection of main frame URL

inconsistency.

Bug: 1296292,1286275
Change-Id: I1e97bd2fe134627ae28ded465286ace6738c2cab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3453045


Auto-Submit: Chris Bookholt <bookholt@chromium.org>
Reviewed-by: Charles Reis <creis@chromium.org>
Commit-Queue: Charles Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#970712}