Disable flaky test (ScreenCapturerIntegrationTest.CaptureUpdatedRegion)

NOTRY=true
BUG=webrtc:6666

Review-Url: https://codereview.webrtc.org/2485593002
Cr-Original-Commit-Position: refs/heads/master@{#14946}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: c285012d3fd4a2405a5bf8bd7eb339b76583e8e0
1 file changed