I got three random failures in https://ci.chromium.org/buildbot/tryserver.chromium.win/win7_chromium_rel_ng/71779 all related to webrtc:

* fast/peerconnection/RTCPeerConnection-AddRemoveTrack.html
* fast/peerconnection/RTCPeerConnection-many.html
* fast/peerconnection/RTCPeerConnection-statsSelector.html

The log isn't very helpful in explaining what went wrong:

03:46:49.860 5200 [22820/28415] fast/peerconnection/RTCPeerConnection-AddRemoveTrack.html failed unexpectedly (asserts failed)
03:46:49.858 3584 worker/7 fast/peerconnection/RTCPeerConnection-AddRemoveTrack.html failed:
03:46:49.858 3584 worker/7  asserts failed
03:46:49.936 5200 [22824/28415] fast/peerconnection/RTCPeerConnection-close.html failed unexpectedly (asserts failed)
03:46:49.927 3584 worker/7 fast/peerconnection/RTCPeerConnection-close.html failed:
03:46:49.927 3584 worker/7  asserts failed
03:46:50.091 3584 worker/7 fast/peerconnection/RTCPeerConnection-statsSelector.html output stderr lines:
03:46:50.091 3584   [7460:5560:1228/034650.066:INFO:user_input_monitor_win.cc(157)] RegisterRawInputDevices() failed for RIDEV_REMOVE: The parameter is incorrect. (0x57)
03:46:50.097 5200 [22834/28415] fast/peerconnection/RTCPeerConnection-statsSelector.html failed unexpectedly (text diff)
03:46:50.096 3584 worker/7 fast/peerconnection/RTCPeerConnection-statsSelector.html failed:
03:46:50.097 3584 worker/7  text diff
03:46:50.188 5200 [22837/28415] fast/peerconnection/RTCPeerConnection-getSenders.html failed unexpectedly (asserts failed)
03:46:50.187 3584 worker/7 fast/peerconnection/RTCPeerConnection-getSenders.html failed:
03:46:50.187 3584 worker/7  asserts failed
03:46:50.259 5200 [22840/28415] fast/peerconnection/RTCPeerConnection-garbagecollected.html failed unexpectedly (asserts failed)
03:46:50.259 3584 worker/7 fast/peerconnection/RTCPeerConnection-garbagecollected.html failed: