Fix for 15979- class aliases now have missing concrete members warnings generated on them.

tests/lib/mirrors/abstract_class_test.dart

Index: tests/lib/mirrors/abstract_class_test.dart
diff --git a/tests/lib/mirrors/abstract_class_test.dart b/tests/lib/mirrors/abstract_class_test.dart
index 230097e771f26e1de2cc70868d839bf03144eb90..00e108172dfd62cee2c395411510acc96021a2a8 100644
--- a/tests/lib/mirrors/abstract_class_test.dart
+++ b/tests/lib/mirrors/abstract_class_test.dart
@@ -130,7 +130,7 @@ abstract class NamedMA = S with M;
 class SubNamedMA extends NamedMA {
   mixinFoo() {}
 }
-class ConcreteNamedMA = S with M;
+class ConcreteNamedMA = S with M; /// 00: static type warning
 
 abstract class NamedMA2 = S with M2;
 class SubNamedMA2 extends NamedMA2 {
@@ -159,8 +159,8 @@ testNamedMixinApplication() {
   // Application is concrete.
   {
   // Mixin is abstract.
-  Expect.isFalse(reflectClass(ConcreteNamedMA).isAbstract);
-  Expect.isFalse(reflectClass(ConcreteNamedMA).superclass.isAbstract);
+  Expect.isFalse(reflectClass(ConcreteNamedMA).isAbstract); /// 00: ok
+  Expect.isFalse(reflectClass(ConcreteNamedMA).superclass.isAbstract); /// 00: ok
 
   // Mixin is concrete.
   Expect.isFalse(reflectClass(ConcreteNamedMA2).isAbstract);