Update from https://crrev.com/308331

build/android/pylib/remote/device/remote_device_helper.py

+# Copyright 2014 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.
+
+"""Common functions and Exceptions for remote_device_*"""
+
+
+class RemoteDeviceError(Exception):
+  """Exception to throw when problems occur with remote device service."""
+  pass
+
+
+def TestHttpResponse(response, error_msg):
+  """Checks the Http response from remote device service.
+
+  Args:
+      response: response dict from the remote device service.
+      error_msg: Error message to display if bad response is seen.
+  """
+  if response.status_code != 200:
+    raise RemoteDeviceError(error_msg)