[Android] Remove hand-rolled adb devices call from bb_device_status_check.

build/android/pylib/device/adb_wrapper.py

 # Copyright 2013 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.
 
 """This module wraps Android's adb tool.
 
 This is a thin wrapper around the adb interface. Any additional complexity
 should be delegated to a higher level (ex. DeviceUtils).
 """
 
@@ skipping 157 matching lines @@
     """DEPRECATED. Refer to Devices(...) below."""
     # TODO(jbudorick): Remove this function once no more clients are using it.
     return cls.Devices(timeout=timeout, retries=retries)
 
   @classmethod
   def Devices(cls, is_ready=True, timeout=_DEFAULT_TIMEOUT,
               retries=_DEFAULT_RETRIES):
     """Get the list of active attached devices.
 
     Args:
+      is_ready: Whether the devices should be limited to only those that are
+        ready for use.
       timeout: (optional) Timeout per try in seconds.
       retries: (optional) Number of retries to attempt.
 
     Yields:
       AdbWrapper instances.
     """
     output = cls._RunAdbCmd(['devices'], timeout=timeout, retries=retries)
     lines = (line.split() for line in output.splitlines())
     return [AdbWrapper(line[0]) for line in lines
             if len(line) == 2 and (not is_ready or line[1] == _READY_STATE)]
@@ skipping 409 matching lines @@
   @property
   def is_emulator(self):
     return _EMULATOR_RE.match(self._device_serial)
 
   @property
   def is_ready(self):
     try:
       return self.GetState() == _READY_STATE
     except device_errors.CommandFailedError:
       return False