Returns the MediaRouter object associated with the global request context.
If |callback| is non-NULL it will be executed asnychronously on the UI
thread after the manager's storage has been initialized. Equivalent to
calling cef_request_context_t::cef_request_context_get_global_context()->get
_media_router().
Returns the MediaRouter object associated with the global request context. If |callback| is non-NULL it will be executed asnychronously on the UI thread after the manager's storage has been initialized. Equivalent to calling cef_request_context_t::cef_request_context_get_global_context()->get _media_router().