[Cronet] Get Cronet's javaperftest running again

components/cronet/android/test/javaperftests/android_rndis_forwarder.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import atexit
 import logging
 import os
 import re
 import socket
 import struct
@@ skipping 10 matching lines @@
 class AndroidRndisForwarder(object):
   """Forwards traffic using RNDIS. Assumes the device has root access."""
 
   def __init__(self, device, rndis_configurator):
     self._device = device
     self._rndis_configurator = rndis_configurator
     self._device_iface = rndis_configurator.device_iface
     self._host_ip = rndis_configurator.host_ip
     self._original_dns = None, None, None
     self._RedirectPorts()
-    self._OverrideDns()
+    # The netd commands fail on Lollipop and newer releases, but aren't
+    # necessary as DNS isn't used.
+    # self._OverrideDns()
     self._OverrideDefaultGateway()
     # Need to override routing policy again since call to setifdns
     # sometimes resets policy table
     self._rndis_configurator.OverrideRoutingPolicy()
     atexit.register(self.Close)
     # TODO(tonyg): Verify that each port can connect to host.
 
   @property
   def host_ip(self):
     return self._host_ip
@@ skipping 444 matching lines @@
       device_iface, host_iface = self._CheckEnableRndis(force)
       self._ConfigureNetwork(device_iface, host_iface)
       self.OverrideRoutingPolicy()
       # Sometimes the first packet will wake up the connection.
       for _ in range(3):
         if self._TestConnectivity():
           return
       force = True
     self.RestoreRoutingPolicy()
     raise Exception('No connectivity, giving up.')