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Since LKGR is sometimes lagging behind, always use HEAD to minimize the number of commits to bisect when something breaks for us. As long as the rolls are passing our CQ, we should be fine. BUG=webrtc:4688 R=phoglund@webrtc.org Review URL: https://codereview.webrtc.org/1379173002 . Cr-Commit-Position: refs/heads/master@{#10139}