GitLab

Explicitly match only on literal . characters instead of any characters.
Add explanatory comment.

Bug: 1078229
Change-Id: I1f248d270ebd22f17aebaad55750d5bed9a275a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519897
Auto-Submit: Peter Wen <wnwen@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824128}