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This is a minimal fix to avoid renderer kills for about:blank URLs
being committed in the wrong process. This restores M78 about:blank
behavior in a very narrow case and is intended to be easily merged to
the M79 branch.

Bug: 931895
Change-Id: Ie958b667f6879afbcebfe18e3f3f80f8cd88884b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1922693
Commit-Queue: Aaron Colwell <acolwell@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Auto-Submit: Aaron Colwell <acolwell@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716422}