Suppress a WebKit failure on Mac while we investigate.
Suppress a WebKit failure on Mac while we investigate.

BUG=19842 (http://crbug.com/19842)
TEST=Covered by layout test

Review URL: http://codereview.chromium.org/174150

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@23843 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