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This CL is fixing a case where a successful navigation to a regular web URL
can commit in the dedicated error page process. It is one of the two ways
found to cause renderer process termination described in
https://crbug.com/866549.

Bug: 866549
Change-Id: If7a49c47feef35b954c67e7f6bd2339641473bf7
Reviewed-on: https://chromium-review.googlesource.com/1165593
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583708}