remove erroneously redefined function from run_tests.py

The function was added in 824c234de8.

tools/run_tests/run_tests.py

@@ -1204,18 +1204,6 @@ def _shut_down_legacy_server(legacy_server_port):
         'http://localhost:%d/quitquitquit' % legacy_server_port).read()
 
 
-def _shut_down_legacy_server(legacy_server_port):
-  try:
-    version = int(urllib2.urlopen(
-        'http://localhost:%d/version_number' % legacy_server_port,
-        timeout=10).read())
-  except:
-    pass
-  else:
-    urllib2.urlopen(
-        'http://localhost:%d/quitquitquit' % legacy_server_port).read()
-
-
 def _start_port_server(port_server_port):
   # check if a compatible port server is running
   # if incompatible (version mismatch) ==> start a new one