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WebLayer had a lot of presubmit warnings related to javadocs, which I
think was causing people to forget to run "git cl format". This fixes
all warnings, so we should no longer ignore presubmit findings.

Change-Id: I68baa6f22c38fe54d65a3affc65117dbfd5ec1c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913203
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714730}