Update from https://crrev.com/327068

build/android/tombstones.py

Index: build/android/tombstones.py
diff --git a/build/android/tombstones.py b/build/android/tombstones.py
index 1a958ac28673c9d9a7ac83adc8c64fa6f75b9f5f..c83a584800fc70042e4e1d7d8f7faf22e9cdeb86 100755
--- a/build/android/tombstones.py
+++ b/build/android/tombstones.py
@@ -19,7 +19,7 @@ import subprocess
 import sys
 import optparse
 
-from pylib import android_commands
+from pylib.device import adb_wrapper
 from pylib.device import device_errors
 from pylib.device import device_utils
 from pylib.utils import run_tests_helper
@@ -233,19 +233,19 @@ def main():
   options, _ = parser.parse_args()
 
   if options.device:
-    devices = [options.device]
+    devices = [device_utils.DeviceUtils(options.device)]
   else:
-    devices = android_commands.GetAttachedDevices()
+    devices = device_utils.DeviceUtils.HealthyDevices()
 
   # This must be done serially because strptime can hit a race condition if
   # used for the first time in a multithreaded environment.
   # http://bugs.python.org/issue7980
   tombstones = []
-  for device_serial in devices:
-    device = device_utils.DeviceUtils(device_serial)
+  for device in devices:
     tombstones += _GetTombstonesForDevice(device, options)
 
   _ResolveTombstones(options.jobs, tombstones)
 
+
 if __name__ == '__main__':
   sys.exit(main())