Use the zygote for extension page popup processes.
Use the zygote for extension page popup processes.

BUG=29377

Review URL: http://codereview.chromium.org/464041

git-svn-id: http://src.chromium.org/svn/trunk/src@33858 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 30004371eb38ec845451e2dc90c2ef59db8659d3
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