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For consistency with https://crrev.com/c/1333014
- remove type="text/javascript"
- replace "var" with "const"

Change-Id: Ie809fa22763494fd6ca4b20112d4a3e6afdd1f0b
Reviewed-on: https://chromium-review.googlesource.com/c/1350431Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611511}