dart2js: Use an abstract Name class for names in the generated JavaScript ast.

pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart

Index: pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart b/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
index 98893f8630bc428eeee63f59cefd720693a1d612..834e90b1719989850205a572b8c1db380b5e5bf8 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
@@ -42,8 +42,8 @@ class JsTreeBuilder extends Builder {
 
   Expression visitInterceptor(cps_ir.Interceptor node) {
     Element getInterceptor = _glue.getInterceptorMethod;
-    String name = _glue.getInterceptorName(node.interceptedClasses);
-    Selector selector = new Selector.call(name, null, 1);
+    // TODO(asgerf): Do not use selectors here.
+    Selector selector = new Selector.call("getInterceptor", null, 1);
     _glue.registerUseInterceptorInCodegen();
     return new InvokeStatic(
         getInterceptor,