[cros] Move User class to user_manager component.

Depends on https://codereview.chromium.org/400973002/

BUG=387614
[email protected],[email protected],[email protected]

Review URL: https://codereview.chromium.org/398753004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284925 0039d316-1c4b-4281-b951-d872f2087c98
164 files changed