Make notifications appear after the topmost one is closed.

Mouse tracking suffers when we close notifications due to a poor ordering
in Views code.  This reorders the events in such a way that we are properly tracking mouse exits.

BUG=299183

Review URL: https://codereview.chromium.org/24903002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226268 0039d316-1c4b-4281-b951-d872f2087c98
Remove notifications from TitleWatcher.

BUG=170921
TEST=tests keep working

Review URL: https://codereview.chromium.org/25115002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226269 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226268
SVN changes up to revision 226269