No longer work around issue 7761.

utils/pub/io.dart

 // Copyright (c) 2012, 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.
 
 /// Helper functionality to make working with IO easier.
 library io;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
@@ skipping 592 matching lines @@
       // Writing empty data to a closed stream can cause errors.
       if (data.isEmpty) return;
 
       // TODO(nweiz): remove this try/catch when issue 7836 is fixed.
       try {
         _outputStream.write(data);
       } catch (e, stack) {
         if (!completed) completer.completeError(e, stack);
         completed = true;
       }
-    }, onDone: () {
-      _outputStream.close();
-      // TODO(nweiz): wait until _outputStream.onClosed is called once issue
-      // 7761 is fixed.
-      if (!completed) completer.complete(null);
-      completed = true;
-    });
+    }, onDone: () => _outputStream.close());
 
     _outputStream.onError = (e) {
       if (!completed) completer.completeError(e);
       completed = true;
     };
 
+    _outputStream.onClosed = () {
+      if (!completed) completer.complete();
+      completed = true;
+    };
+
     return completer.future;
   }
 }
 
 /// Spawns and runs the process located at [executable], passing in [args].
 /// Returns a [Future] that will complete with the results of the process after
 /// it has ended.
 ///
 /// The spawned process will inherit its parent's environment variables. If
 /// [environment] is provided, that will be used to augment (not replace) the
@@ skipping 392 matching lines @@
 Directory _getDirectory(entry) {
   if (entry is Directory) return entry;
   return new Directory(entry);
 }
 
 /// Gets a [Uri] for [uri], which can either already be one, or be a [String].
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }