Revert change 6946.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 6949)
+++ runtime/vm/object.cc	(working copy)
@@ -2739,32 +2739,6 @@
 }
 
 
-bool InstantiatedType::Equals(const AbstractType& other) const {
-  if (raw() == other.raw()) {
-    return true;
-  }
-  if (!other.IsInstantiatedType()) {
-    return false;
-  }
-  InstantiatedType& other_instantiated = InstantiatedType::Handle();
-  other_instantiated ^= other.raw();
-  if (IsFinalized() != other_instantiated.IsFinalized()) {
-    return false;
-  }
-  const AbstractType& this_type = AbstractType::Handle(uninstantiated_type());
-  const AbstractType& other_type =
-      AbstractType::Handle(other_instantiated.uninstantiated_type());
-  if (!this_type.Equals(other_type)) {
-    return false;
-  }
-  if (instantiator_type_arguments() !=
-      other_instantiated.instantiator_type_arguments()) {
-    return false;
-  }
-  return true;
-}
-
-
 const char* InstantiatedType::ToCString() const {
   return "InstantiatedType";
 }