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Several WebUI pages have recently been migrated to mojo JS modules. In
the process, full closure type checking was inadvertently disabled due
to incorrect use of js_type_check closure_flags.

This re-enables full type checking for the affected pages and fixes any
existing flaws revealed as a result

Bug: 1004256
Change-Id: If11808a64501606a784495baeb2543cee33daf0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518089
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824164}