dart2js: Make usage of names more consistent between compiler and runtime.

pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart
index e01100546b4e9cfef7702382ff912f7a78d73e7d..aed7c6877e9fb4c5bab4fd4b96b39cd75d4be219 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/type_test_emitter.dart
@@ -64,7 +64,7 @@ class TypeTestEmitter extends CodeEmitterHelper {
       }
       RuntimeTypes rti = backend.rti;
       jsAst.Expression encoding = rti.getSignatureEncoding(type, thisAccess);
-      String operatorSignature = namer.operatorSignature();
+      String operatorSignature = namer.operatorSignature;
       if (!type.containsTypeVariables) {
         builder.functionType = '${emitter.metadataEmitter.reifyType(type)}';
       } else {