Allow creating HTML notifications with the data: scheme.  I've confirmed this doesn't open up the same extra privileges as javascript: scheme, which is still disallowed.
Allow creating HTML notifications with the data: scheme.  I've confirmed this doesn't open up the same extra privileges as javascript: scheme, which is still disallowed.

BUG=32470
TEST=create HTML notifications using data: 

Review URL: http://codereview.chromium.org/2779005

git-svn-id: http://src.chromium.org/svn/trunk/src@49327 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 964c0a225db50070219c7cca014d9a84c57d043a
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