Tweak a couple of method signatures for unittest methods so that they are more consistent.

pkg/utf/lib/src/utf/utf_stream.dart

 // Copyright (c) 2013, 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.
 
 part of utf;
 
 // TODO(floitsch): make this transformer reusable.
 abstract class _StringDecoder
     implements StreamTransformer<List<int>, String>, EventSink<List<int>> {
   List<int> _carry;
@@ skipping 60 matching lines @@
       if (_buffer.length > 0) {
         // Limit to 'goodChars', if lower than actual charCodes in the buffer.
         _outSink.add(new String.fromCharCodes(_buffer));
       }
       _buffer = null;
     } catch (e, stackTrace) {
       _outSink.addError(e, stackTrace);
     }
   }
 
-  void addError(Object error, [StackTrace stackTrace]) {
+  void addError(error, [StackTrace stackTrace]) {
     _outSink.addError(error, stackTrace);
   }
 
   void close() {
     if (_carry != null) {
       if (_replacementChar != null) {
         _outSink.add(new String.fromCharCodes(
             new List.filled(_carry.length, _replacementChar)));
       } else {
         throw new ArgumentError('Invalid codepoint');
@@ skipping 90 matching lines @@
           }
           _outSink = sink;
           return this;
         });
   }
 
   void add(String data) {
     _outSink.add(_processString(data));
   }
 
-  void addError(Object error, [StackTrace stackTrace]) {
+  void addError(error, [StackTrace stackTrace]) {
     _outSink.addError(error, stackTrace);
   }
 
   void close() { _outSink.close(); }
 
   List<int> _processString(String string);
 }
 
 /**
  * StringTransformer that UTF-8 encodes a stream of strings.
  */
 class Utf8EncoderTransformer extends _StringEncoder {
   List<int> _processString(String string) {
-    var bytes = [];
+    var bytes = <int>[];
     int pos = 0;
     List<int> codepoints = utf16CodeUnitsToCodepoints(string.codeUnits);
     int length = codepoints.length;
     for (int i = 0; i < length; i++) {
       int additionalBytes;
       int charCode = codepoints[i];
       if (charCode <= 0x007F) {
         additionalBytes = 0;
         bytes.add(charCode);
       } else if (charCode <= 0x07FF) {
@@ skipping 11 matching lines @@
       }
       for (int i = additionalBytes; i > 0; i--) {
         // 10xxxxxx (xxxxxx is next 6 bits from the top).
         bytes.add(((charCode >> (6 * (i - 1))) & 0x3F) | 0x80);
       }
       pos += additionalBytes + 1;
     }
     return bytes;
   }
 }