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Follow from CL:2534553 move the duplicated code to app_util.js, satisfy
the dependencies and re-use the code from app_util.js.

Bug: 1148545, 1133186, 1113981
Change-Id: I7dc089a8cf1c371eb3d59702464839faf3004a8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535900Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827700}