Fix validation error bubble focus issues on Windows.

BUG=306464
R=estade@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/33953003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230070 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230070