The peer connection loopback test could catch regressions too, but it's
too slow to run on downstream ARM emulators. I'm adding a test here
that just makes sure we can load the JNI and init audio/video engines
in WebRTC.
This test overlaps in functionality with the existing tests,
but we need it anyway since all existing tests are too timing-sensitive.
Removes resources from the test; they're awkward downstream and we
don't really need them anyway.
BUG=b/32820229
Review-Url: https://codereview.webrtc.org/2506603002
Cr-Commit-Position: refs/heads/master@{#15101}
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