Disable clang Chrome plugins on all platforms.
Disable clang Chrome plugins on all platforms.

(Will fix Linux-clang bot).

TBR=wu@webrtc.org
BUG=issue163
TEST=build on Linux-clang

Review URL: https://webrtc-codereview.appspot.com/545005

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@2152 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override