The removed code stood for optional dependencies to im_chat module (integrate 'odoo support' in chat contact list). Since the new javascript system (require and define) doesn't allow optional dependency, this code will always crash if im_chat was not installed, causing warning in the js console.
The 'im_livechat.im_livechat' js dependency is a wrong conversion of the code to the new js system. im_livechat is not a dependency, but is loaded from OpenERP service server. Since this one runs under odoo-saas6 version, im_odoo_support will load js code fomr this version, and so require to use 'openerp' js object instead of the 'require' dependency.
Jérome Maes
99ac98a064