Enable presubmit pylint in build/android.

build/android/pylib/base/test_dispatcher_unittest.py

Index: build/android/pylib/base/test_dispatcher_unittest.py
diff --git a/build/android/pylib/base/test_dispatcher_unittest.py b/build/android/pylib/base/test_dispatcher_unittest.py
index c6078dbdfcfca6f0bb433067139f8158cd181920..8411b33f61e9c9b208822d4b10be0b16b814efad 100644
--- a/build/android/pylib/base/test_dispatcher_unittest.py
+++ b/build/android/pylib/base/test_dispatcher_unittest.py
@@ -15,11 +15,10 @@ sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
 from pylib import android_commands
 android_commands.GetAttachedDevices = lambda: ['0', '1']
 from pylib import constants
+from pylib.base import base_test_result
+from pylib.base import test_dispatcher
 from pylib.utils import watchdog_timer
 
-import base_test_result
-import test_dispatcher
-
 
 class TestException(Exception):
   pass
@@ -191,7 +190,7 @@ class TestShard(unittest.TestCase):
     android_commands.GetAttachedDevices = lambda: []
     try:
       with self.assertRaises(AssertionError):
-        results, exit_code = TestShard._RunShard(MockRunner)
+        _results, _exit_code = TestShard._RunShard(MockRunner)
     finally:
       android_commands.GetAttachedDevices = attached_devices