[build/android] Fix device.RunShellCommand usages

build/android/pylib/local/device/local_device_monkey_test_run.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 logging
 
 from devil.android import device_errors
 from devil.android.sdk import intent
 from pylib import constants
 from pylib.base import base_test_result
@@ skipping 97 matching lines @@
              '--throttle', str(self._test_instance.throttle),
              '-s', str(self._test_instance.seed),
              '--monitor-native-crashes',
              '--kill-process-after-error']
       for category in self._test_instance.categories:
         cmd.extend(['-c', category])
       for _ in range(self._test_instance.verbose_count):
         cmd.append('-v')
       cmd.append(str(self._test_instance.event_count))
       return device.RunShellCommand(
-          cmd, timeout=self._test_instance.timeout)
+          cmd, timeout=self._test_instance.timeout, check_return=True)
     finally:
       try:
         # Kill the monkey test process on the device. If you manually
         # interupt the test run, this will prevent the monkey test from
         # continuing to run.
         device.KillAll('com.android.commands.monkey')
       except device_errors.CommandFailedError:
         pass