dart2js: set needsTearOff when creating the getter/setter stubs in the new emitter.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
index 1be615cc3b775e18d9477cb7b377b6dafeddc5e0..bbfecfee9809e0decfa42f31a22599383779264f 100644
--- a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
@@ -324,7 +324,7 @@ class ModelEmitter {
     js.Expression fieldName = js.string(field.name);
     js.Expression code = js.js(getterTemplateFor(field.getterFlags), fieldName);
     String getterName = "${namer.getterPrefix}${field.name}";
-    return new StubMethod(getterName, code);
+    return new StubMethod(getterName, code, needsTearOff: false);
   }
 
   Method _generateSetter(InstanceField field) {
@@ -339,7 +339,7 @@ class ModelEmitter {
     js.Expression fieldName = js.string(field.name);
     js.Expression code = js.js(setterTemplateFor(field.setterFlags), fieldName);
     String setterName = "${namer.setterPrefix}${field.name}";
-    return new StubMethod(setterName, code);
+    return new StubMethod(setterName, code, needsTearOff: false);
   }
 
   Iterable<Method> _generateGettersSetters(Class cls) {