Clean up gclient MergeDependencies

gclient_utils.py

Index: gclient_utils.py
diff --git a/gclient_utils.py b/gclient_utils.py
index 0d5714acc00ac5f67407f6ff30dd46c37cc8fabb..5fd794519630b4f4eff548d59d2bb8c03d354948 100644
--- a/gclient_utils.py
+++ b/gclient_utils.py
@@ -901,3 +901,16 @@ 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__)