dart2js: Fix static initializer.

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
index 800b63e0b51861620a6eb18834f80125470bf64d..1d1df634d3e12ede4036e58eaaf97be152ef3fa6 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
@@ -597,8 +597,7 @@ class CodeEmitterTask extends CompilerTask {
                 // 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)
@@ -1336,7 +1335,7 @@ class CodeEmitterTask extends CompilerTask {
 
     for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {
       if (!descriptors.containsKey(outputUnit)) continue;
- 
+
       ClassBuilder descriptor = descriptors[outputUnit];
 
       jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library);