Re-enabling 3 NTP PyAuto tests on linux.
Re-enabling 3 NTP PyAuto tests on linux.

Refer to crbug.com/78855 for details.

BUG=78855
TEST=None

Review URL: http://codereview.chromium.org/6828001

git-svn-id: http://src.chromium.org/svn/trunk/src@81314 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d22d9119266fe491548073318b5efdbcc4eec6c4
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