Fix a number of editor errors and warnings in io tests

tests/standalone/src/io/ListOutputStreamTest.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.
 
 #import("dart:io");
 #import("dart:isolate");
 
 void testEmptyListOutputStream1() {
-  OutputStream stream = new ListOutputStream();
+  ListOutputStream stream = new ListOutputStream();
   Expect.equals(null, stream.contents());
   stream.close();
   Expect.equals(null, stream.contents());
   Expect.throws(() { stream.write([0]); });
 }
 
 
 void testEmptyListOutputStream2() {
-  OutputStream stream = new ListOutputStream();
+  ListOutputStream stream = new ListOutputStream();
   ReceivePort donePort = new ReceivePort();
 
   void onNoPendingWrites() {
     stream.close();
   }
 
   void onClosed() {
     Expect.equals(null, stream.contents());
     donePort.toSendPort().send(null);
   }
 
   stream.onNoPendingWrites = onNoPendingWrites;
   stream.onClosed = onClosed;
 
   donePort.receive((x,y) => donePort.close());
 }
 
 
 void testListOutputStream1() {
-  OutputStream stream = new ListOutputStream();
+  ListOutputStream stream = new ListOutputStream();
   Expect.equals(null, stream.contents());
   stream.write([1, 2]);
   stream.writeFrom([1, 2, 3, 4, 5], 2, 2);
   stream.write([5]);
   stream.close();
   var contents = stream.contents();
   Expect.equals(5, contents.length);
   for (var i = 0; i < contents.length; i++) Expect.equals(i + 1, contents[i]);
   Expect.equals(null, stream.contents());
 }
 
 
 void testListOutputStream2() {
-  OutputStream stream = new ListOutputStream();
+  ListOutputStream stream = new ListOutputStream();
   ReceivePort donePort = new ReceivePort();
   int stage = 0;
   void onNoPendingWrites() {
     switch (stage) {
       case 0:
         stream.write([1, 2]);
         break;
       case 1:
         stream.writeFrom([1, 2, 3, 4, 5], 2, 2);
         break;
@@ skipping 16 matching lines @@
     donePort.toSendPort().send(null);
   }
 
   stream.onNoPendingWrites = onNoPendingWrites;
   stream.onClosed = onClosed;
 
   donePort.receive((x,y) => donePort.close());
 }
 
 void testListOutputStream3() {
-  OutputStream stream = new ListOutputStream();
+  ListOutputStream stream = new ListOutputStream();
   ReceivePort donePort = new ReceivePort();
   void onNoPendingWrites() {
     stream.writeString("abcdABCD");
     stream.writeString("abcdABCD", Encoding.UTF_8);
     stream.writeString("abcdABCD", Encoding.ISO_8859_1);
     stream.writeString("abcdABCD", Encoding.ASCII);
     stream.writeString("æøå", Encoding.UTF_8);
     stream.close();
   }
 
   void onClosed() {
     var contents = stream.contents();
     Expect.equals(38, contents.length);
     donePort.toSendPort().send(null);
   }
 
   stream.onNoPendingWrites = onNoPendingWrites;
   stream.onClosed = onClosed;
 
   donePort.receive((x,y) => donePort.close());
 }
 
 main() {
   testEmptyListOutputStream1();
   testEmptyListOutputStream2();
   testListOutputStream1();
   testListOutputStream2();
   testListOutputStream3();
 }