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Simple adaptation of this WebUI to use JS modules in lieu of manually
managing dependency imports.

Bug: 1004256
Change-Id: Ib9e5477f1a1578772f9a2d657d41aa5c36aee516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556700
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830767}