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There are three WebUIs defined in Content which use Mojo:

- gpu
- process-internals
- conversion-internals

These are adapted here to use newer Mojo JS modules.

Bug: 1004256
Change-Id: If766eb81599d9311b79076011a8ac1d08f343927
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2555806Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Auto-Submit: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#832130}