Revert "Reapply "Implement new model for class members." and "Implement new model for interface mem…

tests/compiler/dart2js/lookup_member_test.dart

Index: tests/compiler/dart2js/lookup_member_test.dart
diff --git a/tests/compiler/dart2js/lookup_member_test.dart b/tests/compiler/dart2js/lookup_member_test.dart
index 70a93f1a9d8f5a5a802000f2ccd74c79735bae4a..f87b6729cd69f9acda71b1558ec675d3a86a59d7 100644
--- a/tests/compiler/dart2js/lookup_member_test.dart
+++ b/tests/compiler/dart2js/lookup_member_test.dart
@@ -30,9 +30,9 @@ void test() {
         V boz;
       }
       """).then((env) {
-    void expect(InterfaceType receiverType, String memberName,
+    void expect(DartType receiverType, String memberName,
                 DartType expectedType) {
-      InterfaceTypeMember member = receiverType.lookupMember(memberName);
+      Member member = receiverType.lookupMember(memberName);
       Expect.isNotNull(member);
       DartType memberType = member.computeType(env.compiler);
       Expect.equals(expectedType, memberType,