Fix the build by disabling asynchrony_test.

pkg/analysis_server/test/integration/asynchrony_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.integration.analysis.error;
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 import '../reflective_tests.dart';
 import 'integration_tests.dart';
 
 main() {
-  runReflectiveTests(AsynchronyIntegrationTest);
+//  runReflectiveTests(AsynchronyIntegrationTest);
 }
 
 /**
  * Verify that the server's input and output streams are asynchronous by
  * attempting to flood its input buffer with commands without listening to
  * its output buffer for responses.  The server should continue to train its
  * input buffer even though its output buffer is full.
  *
  * Once enough commands have been sent, we begin reading from the server's
  * output buffer, and verify that it responds to the last command.
+ *
+ * NB.
+ *
+ * This test was intentionally disabled, because after r43123 server
+ * writes to stdout synchronously. So, now it is the client's responsibility
+ * to read stdout in a timely manner to avoid blocking the server.
  */
 @reflectiveTest
 class AsynchronyIntegrationTest {
   /**
    * Number of messages to queue up before listening for responses.
    */
   static const MESSAGE_COUNT = 10000;
 
   /**
    * Connection to the analysis server.
@@ skipping 27 matching lines @@
 
       // Terminate the test when the response to the last message is received.
       return lastMessageResult.then((_) {
         server.send("server.shutdown", null).then((_) {
           return server.exitCode;
         });
       });
     });
   }
 }