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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@52078 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