dart2js: Also use new abstract names in csp mode.

pkg/compiler/lib/src/js_emitter/class_stub_generator.dart

Index: pkg/compiler/lib/src/js_emitter/class_stub_generator.dart
diff --git a/pkg/compiler/lib/src/js_emitter/class_stub_generator.dart b/pkg/compiler/lib/src/js_emitter/class_stub_generator.dart
index 45604fde11f127f19dbb3d1661e6eaee318949a9..366d76919df75b84e45a63eb96e20c824d9253ba 100644
--- a/pkg/compiler/lib/src/js_emitter/class_stub_generator.dart
+++ b/pkg/compiler/lib/src/js_emitter/class_stub_generator.dart
@@ -12,7 +12,7 @@ class ClassStubGenerator {
   ClassStubGenerator(this.compiler, this.namer, this.backend);
 
   jsAst.Expression generateClassConstructor(ClassElement classElement,
-                                            Iterable<String> fields) {
+                                            Iterable<jsAst.Name> fields) {
     // TODO(sra): Implement placeholders in VariableDeclaration position:
     //
     //     String constructorName = namer.getNameOfClass(classElement);