ChromeOS login webui refactoring: split user selection/gaia login screens.
Phase two : move user list processing to UserSelectionScreen

BUG=373314
[email protected]

Review URL: https://codereview.chromium.org/296823009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275046 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed