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.
The module system needs to know the dependencies of a given module
before executing the function. This is why the dependencies were
defined once in an array, and then were described one more times in the
call to require.
But a trick can simplify this: the boot function can parse the string
representation of the module and extract the calls to require from it.
It is more work for the processor, but it leads to simpler module
definitions.
Fabien Pinckaers