Always define RTC_NOTREACHED, not just in non-chromium builds

R=tommi@webrtc.org
TBR=tommi

Review URL: https://webrtc-codereview.appspot.com/40189004

Cr-Commit-Position: refs/heads/master@{#8592}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8592 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed