[dart2dart] fix after https://codereview.chromium.org/11227007

lib/compiler/implementation/dart_backend/backend.dart

Index: lib/compiler/implementation/dart_backend/backend.dart
diff --git a/lib/compiler/implementation/dart_backend/backend.dart b/lib/compiler/implementation/dart_backend/backend.dart
index f7cb0e879449d01973978083f2f6a5a420ae2724..0ac9d3e8dc79923a24428aa8ee1f9ca4046d999a 100644
--- a/lib/compiler/implementation/dart_backend/backend.dart
+++ b/lib/compiler/implementation/dart_backend/backend.dart
@@ -310,6 +310,10 @@ class DartBackend extends Backend {
       addClass(classElement);
     };
 
+    compiler.resolverWorld.instantiatedClasses.forEach(
+        (ClassElement classElement) {
+      if (shouldOutput(classElement)) addClass(classElement);
+    });
     resolvedElements.forEach((element, treeElements) {
       if (!shouldOutput(element)) return;
 
@@ -481,6 +485,14 @@ class EmitterUnparser extends Unparser {
     if (node.receiver != null && renames[node.receiver] == '') return;
     super.unparseSendReceiver(node, spacesNeeded: spacesNeeded);
   }
+
+  unparseFunctionName(Node name) {
+    if (name != null && renames.containsKey(name)) {
+      sb.add(renames[name]);
+    } else {
+      super.unparseFunctionName(name);
+    }
+  }
 }