dart2js: remove name string of function type encoding in metadata.

pkg/compiler/lib/src/js_backend/runtime_types.dart

Index: pkg/compiler/lib/src/js_backend/runtime_types.dart
diff --git a/pkg/compiler/lib/src/js_backend/runtime_types.dart b/pkg/compiler/lib/src/js_backend/runtime_types.dart
index 4e8e3688ed107a195ebc13f246a13c34f212cab5..4d227062267884d0294b382a161a7c6c47dcd401 100644
--- a/pkg/compiler/lib/src/js_backend/runtime_types.dart
+++ b/pkg/compiler/lib/src/js_backend/runtime_types.dart
@@ -675,8 +675,7 @@ class TypeRepresentationGenerator extends DartTypeVisitor {
       properties.add(new jsAst.Property(js.string(name), value));
     }
 
-    jsAst.LiteralString name = js.string(namer.getFunctionTypeName(type));
-    addProperty(namer.functionTypeTag, name);
+    addProperty(namer.functionTypeTag, js.string(''));
     if (type.returnType.isVoid) {
       addProperty(namer.functionTypeVoidReturnTag, js('true'));
     } else if (!type.returnType.treatAsDynamic) {