Support generic methods in reflection.

tests/compiler/dart2js_extra/mirror_printer_test.dart

Index: tests/compiler/dart2js_extra/mirror_printer_test.dart
diff --git a/tests/compiler/dart2js_extra/mirror_printer_test.dart b/tests/compiler/dart2js_extra/mirror_printer_test.dart
index 65af17bad77c96012d9ca7e66101a0a23fceaeb2..8d6c129b739033ba165bf930e376399fd97ce7b5 100644
--- a/tests/compiler/dart2js_extra/mirror_printer_test.dart
+++ b/tests/compiler/dart2js_extra/mirror_printer_test.dart
@@ -20,8 +20,7 @@ import 'dart:mirrors';
 import 'crash_library_metadata.dart'; // This would crash dart2js.
 
 // Importing dart:html to make things interesting.
-// TODO(johnniwinther): Reenable this when #28240 has been fixed.
-// import 'dart:html';
+import 'dart:html'; /// 01: ok
 
 class MirrorPrinter {
   final StringBuffer buffer;
@@ -186,5 +185,5 @@ main() {
   print(MirrorPrinter.stringify(currentMirrorSystem().libraries));
   // Clear the nodes to avoid confusing the fine test framework (by "fine" I
   // mean something else) -- ahe.
-  document.body.nodes.clear();
+  document.body.nodes.clear(); /// 01: continued
 }