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This test may be simplified by using a promise_test rather than an
async_test.  Additionally, using promise_test will simplify the
transition to new mojo bindings and the migration to Web Platform
Tests.

BUG=769412

Change-Id: I4ae41fa5e5fb43ee611cefc8527bb2e078f1bb71
Reviewed-on: https://chromium-review.googlesource.com/690602Reviewed-by: Vincent Scheib <scheib@chromium.org>
Commit-Queue: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505881}