Login pods focusing animation is skipped for login screen after sign out.

For login screen after boot animation kept on.

BUG=280307

Review URL: https://codereview.chromium.org/132883019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249312 0039d316-1c4b-4281-b951-d872f2087c98
[Password Manager] Remove NOTIFICATION_LOGINS_CHANGED

Consumers now register themselves as PasswordStore::Observers to be
notified of any changes.

This is in preparation for making the password manager into a layered
component.

TBR=dubroy@chromium.org
BUG=335148

Review URL: https://codereview.chromium.org/152703002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249313 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249313