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These are the same checks with chrome/test/data/webui/.
Also fixing existing violations.

Bug: 720034,1005029
Change-Id: Ic3db4eab01ce109da7f24c9b6f2480d522b3dfb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826010
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700447}