Dart: Adjusts class Application for removal of Application/Shell Client=

services/dart/test/echo.dart

Index: services/dart/test/echo.dart
diff --git a/services/dart/test/echo.dart b/services/dart/test/echo.dart
index 2d10001fe003c3a895bca1a7502ded7f7b087f4f..98b4dc3265cff88fba9ca7fdfc6aca4a070c5016 100644
--- a/services/dart/test/echo.dart
+++ b/services/dart/test/echo.dart
@@ -35,8 +35,8 @@ class EchoApplication extends Application {
 }
 
 main(List args) {
-  MojoHandle shellHandle = new MojoHandle(args[0]);
+  MojoHandle appHandle = new MojoHandle(args[0]);
   String url = args[1];
-  var echoApplication = new EchoApplication.fromHandle(shellHandle);
+  var echoApplication = new EchoApplication.fromHandle(appHandle);
   echoApplication.listen();
 }