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There should be no functional changes. Existing js will now have its
types checked by the closure_compile target on builds.

Bug: 997273
Change-Id: Ieb9d06b4260238b72381863d5efae49840b61122
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836136
Auto-Submit: Alex Gough <ajgo@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702955}