Revert of [Android] Add --blacklist-file as a command-line option.

build/android/pylib/device/device_blacklist.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.
 
 import json
 import os
 import threading
 
 from pylib import constants
-
-# TODO(jbudorick): Remove this once the blacklist is optional.
-BLACKLIST_JSON = os.path.join(
+_BLACKLIST_JSON = os.path.join(
     constants.DIR_SOURCE_ROOT,
     os.environ.get('CHROMIUM_OUT_DIR', 'out'),
     'bad_devices.json')
 
-class Blacklist(object):
-
-  def __init__(self, path):
-    self._blacklist_lock = threading.RLock()
-    self._path = path
-
-  def Read(self):
-    """Reads the blacklist from the blacklist file.
-
-    Returns:
-      A list containing bad devices.
-    """
-    with self._blacklist_lock:
-      if not os.path.exists(self._path):
-        return []
-
-      with open(self._path, 'r') as f:
-        return json.load(f)
-
-  def Write(self, blacklist):
-    """Writes the provided blacklist to the blacklist file.
-
-    Args:
-      blacklist: list of bad devices to write to the blacklist file.
-    """
-    with self._blacklist_lock:
-      with open(self._path, 'w') as f:
-        json.dump(list(set(blacklist)), f)
-
-  def Extend(self, devices):
-    """Adds devices to blacklist file.
-
-    Args:
-      devices: list of bad devices to be added to the blacklist file.
-    """
-    with self._blacklist_lock:
-      blacklist = ReadBlacklist()
-      blacklist.extend(devices)
-      WriteBlacklist(blacklist)
-
-  def Reset(self):
-    """Erases the blacklist file if it exists."""
-    with self._blacklist_lock:
-      if os.path.exists(self._path):
-        os.remove(self._path)
-
+# Note that this only protects against concurrent accesses to the blacklist
+# within a process.
+_blacklist_lock = threading.RLock()
 
 def ReadBlacklist():
-  # TODO(jbudorick): Phase out once all clients have migrated.
-  return Blacklist(BLACKLIST_JSON).Read()
+  """Reads the blacklist from the _BLACKLIST_JSON file.
+
+  Returns:
+    A list containing bad devices.
+  """
+  with _blacklist_lock:
+    if not os.path.exists(_BLACKLIST_JSON):
+      return []
+
+    with open(_BLACKLIST_JSON, 'r') as f:
+      return json.load(f)
 
 
 def WriteBlacklist(blacklist):
-  # TODO(jbudorick): Phase out once all clients have migrated.
-  Blacklist(BLACKLIST_JSON).Write(blacklist)
+  """Writes the provided blacklist to the _BLACKLIST_JSON file.
+
+  Args:
+    blacklist: list of bad devices to write to the _BLACKLIST_JSON file.
+  """
+  with _blacklist_lock:
+    with open(_BLACKLIST_JSON, 'w') as f:
+      json.dump(list(set(blacklist)), f)
 
 
 def ExtendBlacklist(devices):
-  # TODO(jbudorick): Phase out once all clients have migrated.
-  Blacklist(BLACKLIST_JSON).Extend(devices)
+  """Adds devices to _BLACKLIST_JSON file.
+
+  Args:
+    devices: list of bad devices to be added to the _BLACKLIST_JSON file.
+  """
+  with _blacklist_lock:
+    blacklist = ReadBlacklist()
+    blacklist.extend(devices)
+    WriteBlacklist(blacklist)
 
 
 def ResetBlacklist():
-  # TODO(jbudorick): Phase out once all clients have migrated.
-  Blacklist(BLACKLIST_JSON).Reset()
+  """Erases the _BLACKLIST_JSON file if it exists."""
+  with _blacklist_lock:
+    if os.path.exists(_BLACKLIST_JSON):
+      os.remove(_BLACKLIST_JSON)