Renamed StreamSink to EventSink. Renamed signalError to addError.

tests/standalone/io/string_transformer_test.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:async";
 import "dart:io";
 import "dart:isolate";
 import "dart:utf";
 
 void testUtf8() {
@@ skipping 182 matching lines @@
     .transform(new LineTransformer());
   stream.listen(
       (_) {},
       onDone: () {
         Expect.equals(1, errors);
       },
       onError: (e) {
         errors++;
         Expect.isTrue(e.error is TestException);
       });
-  controller.signalError(new TestException());
+  controller.addError(new TestException());
   controller.close();
 }
 
 testLatin1EncoderError() {
   List<int> data = [0x01,
                     0x7f,
                     0x44, 0x61, 0x72, 0x74,
                     0x80,
                     0xff,
                     0x100];
@@ skipping 14 matching lines @@
 
 main() {
   testUtf8();
   testLatin1();
   testAscii();
   testReadLine1();
   testReadLine2();
   testErrorHandler();
   testLatin1EncoderError();
 }