Take inheritance into account when computing the elements accessible by mirrors.

tests/compiler/dart2js/mirrors_used_test.dart

Index: tests/compiler/dart2js/mirrors_used_test.dart
diff --git a/tests/compiler/dart2js/mirrors_used_test.dart b/tests/compiler/dart2js/mirrors_used_test.dart
index b1e2ad64630cea73278a4fb590f7737d6d6f19d7..5aec8fa5f8464c2def5d7e3ced9df721f9409785 100644
--- a/tests/compiler/dart2js/mirrors_used_test.dart
+++ b/tests/compiler/dart2js/mirrors_used_test.dart
@@ -98,15 +98,15 @@ void main() {
       library.forEachLocalMember((member) {
         if (library == compiler.mainApp && member.name == 'Foo') {
           Expect.isTrue(
-              compiler.backend.isNeededForReflection(member), '$member');
+              compiler.backend.isAccessibleByReflection(member), '$member');
           member.forEachLocalMember((classMember) {
             Expect.isTrue(
-                compiler.backend.isNeededForReflection(classMember),
+                compiler.backend.isAccessibleByReflection(classMember),
                 '$classMember');
           });
         } else {
           Expect.isFalse(
-              compiler.backend.isNeededForReflection(member), '$member');
+              compiler.backend.isAccessibleByReflection(member), '$member');
         }
       });
     }