device_status_check shouldn't expect dumpsys iphonesubinfo to provide output.

build/android/pylib/android_commands.py

 # Copyright (c) 2012 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.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 # pylint: disable-all
 
@@ skipping 1333 matching lines @@
 
   def GetWifiIP(self):
     """Returns the wifi IP on the device."""
     wifi_ip = self.system_properties['dhcp.wlan0.ipaddress']
     # Do not assert here. Devices (e.g. emulators) may not have a WifiIP.
     return wifi_ip
 
   def GetSubscriberInfo(self):
     """Returns the device subscriber info (e.g. GSM and device ID) as string."""
     iphone_sub = self.RunShellCommand('dumpsys iphonesubinfo')
-    assert iphone_sub
+    # Do not assert here. Devices (e.g. Nakasi on K) may not have iphonesubinfo.
     return '\n'.join(iphone_sub)
 
   def GetBatteryInfo(self):
     """Returns a {str: str} dict of battery info (e.g. status, level, etc)."""
     battery = self.RunShellCommand('dumpsys battery')
     assert battery
     battery_info = {}
     for line in battery[1:]:
       k, _, v = line.partition(': ')
       battery_info[k.strip()] = v.strip()
@@ skipping 618 matching lines @@
   """
   def __init__(self, output):
     self._output = output
 
   def write(self, data):
     data = data.replace('\r\r\n', '\n')
     self._output.write(data)
 
   def flush(self):
     self._output.flush()