Mark NewTabUITest.NTPHasThumbnails FLAKY.
Mark NewTabUITest.NTPHasThumbnails FLAKY.

BUG=http://crbug.com/51721
TEST=ui_tests

Review URL: http://codereview.chromium.org/3169003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@55624 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