bug 1229783 - Full router.get_urls implementation
bug 1229783 - Full router.get_urls implementation

Instead of calling super, bring in the get_urls() implementation from
rest_framework.routers.  This code is about to get some modifications,
but this commit doesn't change current functionality.

jwhitlock/web-platform-compat,jwhitlock/web-platform-compat,mdn/browsercompat,jwhitlock/web-platform-compat,mdn/browsercompat,mdn/browsercompat