Disable UITest.MediaUILayoutTest on Linux valgrind bots.
Disable UITest.MediaUILayoutTest on Linux valgrind bots.

BUG=53937
TEST=None
Review URL: http://codereview.chromium.org/3253006

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@57978 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