Disseminate OnProfilesChanged after updating the user model.

r233996 removed OnAppListModelUsersChanged, r239193 put it back as
OnProfilesChanged, but in place of OnSigninStatusChanged, not
OnAppListModelUsersChanged. OnProfilesChanged needs to occur after both.

This CL moves OnProfilesChanged down so that it occurs after both
OnSigninStatusChanged and OnAppListModelUsersChanged would have been
notified in pre-r233996 code.

BUG=325693
TEST=On Mac, have three profiles, one signed in, and show app launcher
on the signed-in profile. Open a browser. Show the app launcher menu and
dismiss. In chrome://settings, delete the other profile. Show the app
launcher menu again -- deleted profile should be gone.

Review URL: https://codereview.chromium.org/109913002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239450 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239450