Mark TaskManagerBrowserTest.NoticeExtensionChanges as flaky.
Mark TaskManagerBrowserTest.NoticeExtensionChanges as flaky.

BUG=51701
TEST=none
Review URL: http://codereview.chromium.org/3124007

git-svn-id: http://src.chromium.org/svn/trunk/src@55586 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4f136e408c592d0cd94a5f3c7cf7d74935e8790c
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