Switch the battery status API to the new Mojo JS bindings

This change updates the battery status API LayoutTests to use the new
Mojo JS bindings.

Bug: 699569
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Ic1a3f249b44a5810eb838eea96cb986c8a9a1c3a
Reviewed-on: https://chromium-review.googlesource.com/579791
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#500144}
15 files changed