Move computation of method flags into model.

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 a2b1c62fac1067953f7190305ed5066e56196c76..0b432aa0c958114d44c737241149c4fdf6a6c97b 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
@@ -315,7 +315,7 @@ 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, needsTearOff: false);
+    return new StubMethod(getterName, code);
   }
 
   Method _generateSetter(Field field) {
@@ -330,7 +330,7 @@ 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, needsTearOff: false);
+    return new StubMethod(setterName, code);
   }
 
   Iterable<Method> _generateGettersSetters(Class cls) {