Enqueue superclasses instead of supertypes.

tests/compiler/dart2js/analyze_unused_dart2js_test.dart

Index: tests/compiler/dart2js/analyze_unused_dart2js_test.dart
diff --git a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
index 8c68b18d92064f24d938922819326cf5aa670adc..a859186ce5fbe37fec6644167386b710699d791e 100644
--- a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
+++ b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
@@ -70,8 +70,13 @@ const Map<String, List<String>> WHITE_LIST = const {
 void main() {
   var uri = currentDirectory.resolve(
       'pkg/compiler/lib/src/use_unused_api.dart');
-  asyncTest(() => analyze([uri], WHITE_LIST,
-      analyzeAll: false, checkResults: checkResults));
+  asyncTest(() => analyze(
+      [uri],
+      // TODO(johnniwinther): Use [WHITE_LIST] again when
+      // [Compiler.reportUnusedCode] is reenabled.
+      const {}, // WHITE_LIST
+      analyzeAll: false,
+      checkResults: checkResults));
 }
 
 bool checkResults(Compiler compiler, CollectingDiagnosticHandler handler) {