Clean up gclient MergeDependencies

gclient_utils.py

Index: gclient_utils.py
diff --git a/gclient_utils.py b/gclient_utils.py
index 47ea50286bf9e2e66347395dd3595966075e0233..cd92843bdae778804d9bdda04de1711a6cf3e7bb 100644
--- a/gclient_utils.py
+++ b/gclient_utils.py
@@ -957,3 +957,16 @@ def NumLocalCpus():
     # Mac OS 10.6 only
     # pylint: disable=E1101
     return int(os.sysconf('SC_NPROCESSORS_ONLN'))
+
+
+class BaseRecord(object):
+  """Base class for objects with equality by value."""
+  @property
+  def __key__(self):
+    return (self.__class__, tuple(self.__dict__.iteritems()))
+
+  def __eq__(self, other):
+    return self.__key__ == getattr(other, '__key__', None)
+
+  def __hash__(self):
+    return hash(self.__key__)