Don't call chrome.initExtension if we already called it.
Don't call chrome.initExtension if we already called it.

BUG=25314

Review URL: http://codereview.chromium.org/315005

git-svn-id: http://src.chromium.org/svn/trunk/src@29738 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 887d0056144aae786dedbe97ef155a1079b06682
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