Disable rtc test again until fixed
Disable rtc test again until fixed

BUG=skia:
TBR=borenet

Review-Url: https://codereview.chromium.org/2230283002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot