dart2js: fix setter name in 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 30d81ed1bd78fa86541919b585709b48c649539f..c940bfcc6f3428dcb1b181216eed0985dadf4aa5 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
@@ -428,7 +428,7 @@ class ModelEmitter {
     }
     js.Expression fieldName = js.string(field.name);
     js.Expression code = js.js(setterTemplateFor(field.setterFlags), fieldName);
-    String setterName = "${namer.setterPrefix}${field.name}";
+    String setterName = "${namer.setterPrefix}${field.accessorName}";
     return new StubMethod(setterName, code);
   }