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views_mus_unittests was calling mojo::core::Init() multiple times, which
leaks. The fix is to move the Init() call to the TestSuite as well as
setting up the ipc thread.

BUG=888533
TEST=test only changes

Change-Id: I852ca0ab4736aa7a4a18d3c650fa6122b320eb9d
Reviewed-on: https://chromium-review.googlesource.com/1249810Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594847}