[rAC, OSX] Always close error bubble on focus loss

BUG=331124
R=isherman@chromium.org

Review URL: https://codereview.chromium.org/123313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243338 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243338