[Android] Some clean up in pylib.

build/android/pylib/io_stats_parser.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.
-"""
-
-
-import collections
-
-
-def ParseIoStatsLine(line):
-  """Parses a line of io stats into a IoStats named tuple."""
-  # Field definitions: http://www.kernel.org/doc/Documentation/iostats.txt
-  IoStats = collections.namedtuple('IoStats',
-                                   ['device',
-                                    'num_reads_issued',
-                                    'num_reads_merged',
-                                    'num_sectors_read',
-                                    'ms_spent_reading',
-                                    'num_writes_completed',
-                                    'num_writes_merged',
-                                    'num_sectors_written',
-                                    'ms_spent_writing',
-                                    'num_ios_in_progress',
-                                    'ms_spent_doing_io',
-                                    'ms_spent_doing_io_weighted',
-                                    ])
-  fields = line.split()
-  return IoStats._make([fields[2]] + [int(f) for f in fields[3:]])