[Android] Reland of Remove android_commands and android_testrunner.

tools/android/appstats.py

Index: tools/android/appstats.py
diff --git a/tools/android/appstats.py b/tools/android/appstats.py
index a785417391cd3a57c9d03443a060459c6bc9a8f4..ba53eacb6c593021b1ff9e0c635207ec11260899 100755
--- a/tools/android/appstats.py
+++ b/tools/android/appstats.py
@@ -19,7 +19,6 @@ sys.path.append(os.path.join(os.path.dirname(__file__),
                              os.pardir,
                              'build',
                              'android'))
-from pylib import android_commands
 from pylib.device import device_errors
 from pylib.device import device_utils
 
@@ -106,7 +105,8 @@ class DeviceHelper(object):
     """Returns a device serial to connect to.  If |preset| is specified it will
     return |preset| if it is connected and |None| otherwise.  If |preset| is not
     specified it will return the first connected device."""
-    devices = android_commands.GetAttachedDevices()
+    devices = [d.adb.GetDeviceSerial()
+               for d in device_utils.DeviceUtils.HealthyDevices()]
     if not devices:
       return None