Change generic comment syntax to real generic syntax.

lib/src/byte_collector.dart

 // Copyright (c) 2017, 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:typed_data";
 
 /// Collects an asynchronous sequence of byte lists into a single list of bytes.
 ///
 /// If the [source] stream emits an error event,
 /// the collection fails and the returned future completes with the same error.
 ///
 /// If any of the input data are not valid bytes, they will be truncated to
 /// an eight-bit unsigned value in the resulting list.
 Future<Uint8List> collectBytes(Stream<List<int>> source) {
-  var byteLists = List<List<int>>[];
+  var byteLists = <List<int>>[];
   var length = 0;
   var completer = new Completer<Uint8List>.sync();
   source.listen(
       (bytes) {
         byteLists.add(bytes);
         length += bytes.length;
       },
       onError: completer.completeError,
       onDone: () {
         completer.complete(_collect(length, byteLists));
       },
       cancelOnError: true);
   return completer.future;
 }
 
 // Join a lists of bytes with a known total length into a single [Uint8List].
 Uint8List _collect(int length, List<List<int>> byteLists) {
   var result = new Uint8List(length);
   int i = 0;
   for (var byteList in byteLists) {
     var end = i + byteList.length;
     result.setRange(i, end, byteList);
     i = end;
   }
   return result;
 }