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This CL ensures that target embedding matches against no-separator top
domains (e.g. "googlecom.example.com") don't trigger if they are too
short. It also ensures that these embedded domains are properly checked
for common words and checked against the target allowlist. In doing
this, it also stops a DCHECK from triggering when a user visited a
domain like "googlecom.example.com" (instead of
"www.googlecom.example.com").

Bug: 1126146, 1127450
Change-Id: I19e0f5735240fad85ea7079c8905e95d2744ac2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416266
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808174}