Previously minimized visiting window will get unminimized upon return to original owner

BUG=318852
TEST=unittest (& visually checked)

Review URL: https://codereview.chromium.org/142543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248329 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248329