Expose getter and setter invocations by name, in dart2js 'World'.

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 db3923a0ab90c271e6626c83c34a8f2bbe299641..dc2aeefa643cee9b8f838c469e4d188ef9466779 100644
--- a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
+++ b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
@@ -47,6 +47,10 @@ const Map<String, List<String>> WHITE_LIST = const {
     "accept", "FunctionExpression", "CreateFunction"
   ],
 
+  "lib/src/universe/universe.dart": const [
+      "The method 'getterInvocationsByName' is never called.",
+      "The method 'setterInvocationsByName' is never called."],
+
   "lib/src/cps_ir/": const [
     "accept", "CreateFunction",
   ],