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This test was added in the early days of mojo and has long been disabled
while mojo and media/mojo evolved. Now media/mojo and the mojo Renderer
path are covered by various other tests and there's no plan to revive
this test. Therefore this CL removes this test.

Bug: 597904
Change-Id: I3adde9430f2601eacca67d8bdde338c37a30e3c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896054Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712885}