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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@81314 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser