[Android] Convert to DeviceUtils versions of WaitUntilFullyBooted and GetExternalStoragePath.

build/android/pylib/utils/test_environment.py

Index: build/android/pylib/utils/test_environment.py
diff --git a/build/android/pylib/utils/test_environment.py b/build/android/pylib/utils/test_environment.py
index 8eff0b0a24c343a56fa22a288478b490da7f52d8..fb681203c93a8b70efb82bc21da55c7838773b6a 100644
--- a/build/android/pylib/utils/test_environment.py
+++ b/build/android/pylib/utils/test_environment.py
@@ -31,11 +31,11 @@ def _KillWebServers():
         logging.warning('Failed waiting for %s to die. %s', p.pid, e)
 
 
-
 def CleanupLeftoverProcesses():
   """Clean up the test environment, restarting fresh adb and HTTP daemons."""
   _KillWebServers()
   did_restart_host_adb = False
+  # TODO(jbudorick) Implement this with the device parallelizer utility.
   for device_serial in android_commands.GetAttachedDevices():
     device = device_utils.DeviceUtils(device_serial)
     # Make sure we restart the host adb server only once.
@@ -49,5 +49,5 @@ def CleanupLeftoverProcesses():
       # TODO(jbudorick) Handle this exception appropriately after interface
       #                 conversions are finished.
       logging.error(str(e))
-    device.old_interface.WaitForDevicePm()
+    device.WaitUntilFullyBooted()