Use <(webrtc_root) to point to webrtc files in tools.gyp.

TBR=brykt@google.com

Review URL: https://webrtc-codereview.appspot.com/939034

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3206 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed