Remove Compiler.openWorld

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index f9885ba2a4e424bee9f0db99a090f847f7747c67..8aa5298c192357abe6ffe7e2fe0aa8f55300382b 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -52,6 +52,8 @@ class ClosureTask extends CompilerTask {
   void createClosureClasses() {
     compiler.enqueuer.resolution.processedElements
         .forEach((AstElement element) {
+      // TODO(johnniwinther): Typedefs should never be in processedElements.
+      if (element.isTypedef) return;
       ResolvedAst resolvedAst = element.resolvedAst;
       if (element.isAbstract) return;
       if (element.isField &&