dart2js: Fix static initializer.

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.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.js_emitter;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 579 matching lines @@
           try {
             if (result === sentinelUndefined) {
               $isolate[fieldName] = sentinelInProgress;
 
               try {
                 result = $isolate[fieldName] = lazyValue();
               } finally {
                 // Use try-finally, not try-catch/throw as it destroys the
                 // stack trace.
                 if (result === sentinelUndefined)
-                  if ($isolate[fieldName] === sentinelInProgress)
-                    $isolate[fieldName] = null;
+                  $isolate[fieldName] = null;
               }
             } else {
               if (result === sentinelInProgress)
                 #(staticName);
             }
 
             return result;
           } finally {
             $isolate[getterName] = function() { return this[fieldName]; };
           }
@@ skipping 717 matching lines @@
       }
     }
     Map<OutputUnit, ClassBuilder> descriptors = elementDescriptors[library];
     String libraryName =
         (!compiler.enableMinification || backend.mustRetainLibraryNames) ?
         library.getLibraryName() :
         "";
 
     for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {
       if (!descriptors.containsKey(outputUnit)) continue;
- 
+
       ClassBuilder descriptor = descriptors[outputUnit];
 
       jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library);
 
       jsAst.ObjectInitializer initializers = descriptor.toObjectInitializer();
 
       CodeBuffer libraryDescriptorBuffer =
           libraryDescriptorBuffers.putIfAbsent(outputUnit,
               () => new CodeBuffer());
 
@@ skipping 553 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }