Revert "Roll chromium_revision ccef3cb..7779e7d (331232:332119)"

This reverts commit a8d686d174bb08f7d297046f86c2f60bce277312.

Reason: TSan v2 bot fails on data race:
http://build.chromium.org/p/client.webrtc/builders/Linux%20Tsan%20v2/builds/3090/steps/rtc_unittests/logs/stdio

TBR=pbos@webrtc.org
BUG=4732

Review URL: https://webrtc-codereview.appspot.com/50159004

Cr-Commit-Position: refs/heads/master@{#9342}
1 file changed