Reload frame in V8Window::namedPropertyGetterCustom after js call

      R=marja@chromium.org

BUG=454954

Review URL: https://codereview.chromium.org/901053006

git-svn-id: svn://svn.chromium.org/blink/trunk@189574 bbb929c8-8fbe-4397-9dbb-9b2b20218538