Remove scanBuiltinLibraries.

sdk/lib/_internal/compiler/implementation/enqueue.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js;
 
 typedef ItemCompilationContext ItemCompilationContextCreator();
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
@@ skipping 422 matching lines @@
    */
   void registerStaticUse(Element element) {
     if (element == null) return;
     assert(invariant(element, element.isDeclaration));
     addToWorkList(element);
     compiler.backend.registerStaticUse(element, this);
   }
 
   void registerGetOfStaticFunction(FunctionElement element) {
     registerStaticUse(element);
-    registerInstantiatedClass(compiler.closureClass,
-                              compiler.globalDependencies);
+    if (compiler.closureClass != null) {
+      // TODO(johnniwinther): Move this to the JavaScript backend.
+      registerInstantiatedClass(compiler.closureClass,
+                                compiler.globalDependencies);
+    }
     universe.staticFunctionsNeedingGetter.add(element);
   }
 
   void registerDynamicInvocation(Selector selector) {
     assert(selector != null);
     registerInvocation(selector);
   }
 
   void registerSelectorUse(Selector selector) {
     if (selector.isGetter) {
@@ skipping 290 matching lines @@
     }
     CodegenWorkItem workItem = new CodegenWorkItem(
         element, itemCompilationContextCreator());
     queue.add(workItem);
   }
 
   void _logSpecificSummary(log(message)) {
     log('Compiled ${generatedCode.length} methods.');
   }
 }