Rename NOTREACHED to RTC_NOTREACHED to avoid name conflict with Chromium

R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/45459004

Cr-Commit-Position: refs/heads/master@{#8591}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8591 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed