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The use of matchBottomLine() function was removed in:
https://codereview.chromium.org/1491543002

Fix var/let violations pointed out by the presubmit.

Change-Id: I94bc7853623ec73e54c066030bca60da37e5795d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2525880
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825273}