Mark PluginTest.FlashLayoutWhilePainting as flaky on Windows.
Mark PluginTest.FlashLayoutWhilePainting as flaky on Windows.

BUG=53926
TEST=slightly greener bots
TBR=phajdan.jr@chromium.org,ananta@chromium.org,viettrungluu@chromium.org

Review URL: http://codereview.chromium.org/3213007

git-svn-id: http://src.chromium.org/svn/trunk/src@57967 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 69ee2f9d2e37eac8536db60bc712fad99fec0e12
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