dart2js: switch to use dart2js_info/info.dart

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 ae21bd30e4a44e52c3712ab55584f1973303d6c1..b1eaf6e168316cab9a2801ac57502964375bb7fe 100644
--- a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
+++ b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
@@ -44,9 +44,6 @@ const Map<String, List<String>> WHITE_LIST = const {
     "accept", "FunctionExpression", "CreateFunction"
   ],
 
-  // AllInfo.fromJson and visit methods are not used yet.
-  "lib/src/info/info.dart": const [ "is never" ],
-
   "lib/src/universe/universe.dart": const [
       "The method 'getterInvocationsByName' is never called.",
       "The method 'setterInvocationsByName' is never called."],