[Fuchsia] Disable media_unittests failing in new SDK

New SDK removed some services that the tests depend on, which broke 2
tests: FuchsiaVideoDecoderTest.H264 and AudioOutputTest.Play200HzTone.
Disabling these tests temporarily until the problem is resolved.

TBR=wez@chromium.org,maxmorin@chromium.org

Bug: 956446
Change-Id: I16f69249f49df6fc6c874196a17bca9973f154dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582034
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653924}
2 files changed