Dart: Refactors Proxies

benchmarks/mojo_rtt_benchmark/lib/main.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This Mojo app is a benchmark of Mojo/Dart IPC Round Trip Times.
 // It creates many proxies from a single isolate, and makes requests using those
 // proxies round-robin.
 // To run it, and the other RTT benchmarks:
 //
 // $ ./mojo/devtools/common/mojo_benchmark [--release] mojo/tools/data/rtt_benchmarks
@@ skipping 78 matching lines @@
     // Using the sync API means that we only record one event after the finish
     // time has been recorded.
     Timeline.startSync("ping");
     return _echo(idx, s).then((r) {
       Timeline.finishSync();
       return r;
     });
   }
 
   Future _echo(int idx, String s) {
-    return _echoProxies[idx].ptr.echoString(s);
+    return _echoProxies[idx].echoString(s);
   }
 
   _errorHandler(Object e) {
     _doEcho = false;
     return Future.wait(_echoProxies.map((p) => p.close())).then((_) {
       MojoHandle.reportLeakedHandles();
     });
   }
 }
 
 main(List args, Object handleToken) {
   MojoHandle appHandle = new MojoHandle(handleToken);
   new EchoTracingApp.fromHandle(appHandle);
 }