Fix type annotation and comment.

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:io';
@@ skipping 590 matching lines @@
   var buffer = new StringBuffer();
   stream.onClosed = () => completer.complete(buffer.toString());
   stream.onData = () => buffer.add(stream.read());
   stream.onError = (e) => completer.completeException(e, stackTrace);
   return completer.future;
 }
 
 /// Wrap an InputStream in a ListInputStream. This eagerly drains the [source]
 /// input stream. This is useful for spawned processes which will not exit until
 /// their output streams have been drained.
-/// TODO(rnystrom): Get rid of this once #7218 is fixed.
+/// TODO(rnystrom): We should use this logic anywhere we spawn a process.
 InputStream wrapInputStream(InputStream source) {
   var sink = new ListInputStream();
   pipeInputToInput(source, sink);
   return sink;
 }
 
 /// 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.
 ///
@@ skipping 407 matching lines @@
   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);
 }