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Navigations to about:version should either be blocked by
RenderProcessHostImpl::FilterURL or rewritten to navigations to
chrome://version/ by url_formatter::FixupURL.  This CL tries to help
catch cases that violate this assumption, by adding an early
NOTREACHED and DumpWithoutCrashing calls.

Bug: 1145717
Change-Id: Icbae9530ca851ae55d44947ac2f8efb754beec90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519861
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825012}