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IncrementCounter has been replaced by IncrementEnumCounter. Since the code has been rolled into Chromium, time to clean this up. R=pthatcher@chromium.org TBR=pthatcher@webrtc.org BUG= Review URL: https://codereview.webrtc.org/1312763013 . Cr-Commit-Position: refs/heads/master@{#9852}