Marking SessionHistoryTest.FrameBackForward flaky on Windows.
Marking SessionHistoryTest.FrameBackForward flaky on Windows.

BUG=48833
TEST=Vista Tests (dbg)(2) should become green

Review URL: http://codereview.chromium.org/2956004

git-svn-id: http://src.chromium.org/svn/trunk/src@52078 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: fc666985f456784eb88fe4f9200dbfe55166d06e
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