Revert "Enqueue superclasses instead of supertypes."

pkg/compiler/lib/src/elements/common.dart

Index: pkg/compiler/lib/src/elements/common.dart
diff --git a/pkg/compiler/lib/src/elements/common.dart b/pkg/compiler/lib/src/elements/common.dart
index 103f874d89d5d6eed694263a0b13d92baf6de835..6c4352a3ed10a338555c15fa627abd8fe890c8b7 100644
--- a/pkg/compiler/lib/src/elements/common.dart
+++ b/pkg/compiler/lib/src/elements/common.dart
@@ -436,11 +436,6 @@ abstract class ClassElementCommon implements ClassElement {
     MemberSignature member = lookupInterfaceMember(Names.call);
     return member != null && member.isMethod ? member.type : null;
   }
-
-  @override
-  bool get isNamedMixinApplication {
-    return isMixinApplication && !isUnnamedMixinApplication;
-  }
 }
 
 abstract class FunctionSignatureCommon implements FunctionSignature {