Disable flaky WebRtcVideoChannel2Base, EndToEndTest tests on Dr. Memory.

BUG=webrtc:4963, webrtc:4979
R=kjellander@webrtc.org, pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1315323008 .

Cr-Commit-Position: refs/heads/master@{#9895}
2 files changed