Don't use FrameLoader::m_provisionalItem for history state if a cross-origin
redirect happens
BUG=500554
Review URL: https://codereview.chromium.org/1175113009
git-svn-id: svn://svn.chromium.org/blink/trunk@198022 bbb929c8-8fbe-4397-9dbb-9b2b20218538