Address review feedback

src/pip/_internal/vcs/__init__.py

@@ -413,8 +413,6 @@ class VersionControl(object):
     def get_url(self, location):
         """
         Return the url used at location
-
-        This is used in obtain().
         """
         raise NotImplementedError
 

src/pip/_internal/vcs/subversion.py

@@ -13,8 +13,6 @@ from pip._internal.vcs import VersionControl, vcs
 
 _svn_xml_url_re = re.compile('url="([^"]+)"')
 _svn_rev_re = re.compile(r'committed-rev="(\d+)"')
-_svn_url_re = re.compile(r'URL: (.+)')
-_svn_revision_re = re.compile(r'Revision: (.+)')
 _svn_info_xml_rev_re = re.compile(r'\s*revision="(\d+)"')
 _svn_info_xml_url_re = re.compile(r'<url>(.*)</url>')