Cleanup: Remove duplicated functions

IncrementCounter has been replaced by IncrementEnumCounter.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}
3 files changed