Add presubmit check to prevent further changes to webrtc/base.
Add presubmit check to prevent further changes to webrtc/base.

R=mbonadei@webrtc.org
TBR=kjellander@webrtc.org
NOTRY=True
BUG=webrtc:7634

Review-Url: https://codereview.webrtc.org/2972363002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18951}

TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc