JimEvans: Updating Element::IsHiddenByOverflow() to correctly return false upon reaching the top-level document.
JimEvans: Updating Element::IsHiddenByOverflow() to correctly return false upon reaching the top-level document.

r17020

krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate