Remove unreachable code from extension.cc.
Remove unreachable code from extension.cc.

BUG=17927
TBR=phajdan.jr@chromium.org

git-svn-id: http://src.chromium.org/svn/trunk/src@23083 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d5df9b1250a8c46248948c21ee8b61ecbbb60c84
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser