Revert "Merge more Kernel infrastructure from kernel_sdk SDK fork."

runtime/lib/typed_data.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.
 
-// Unlike the other SDK libraries, this file is not a patch that is applied to
-// dart:typed_data.  Instead, it completely replaces the implementation from the
-// SDK.
 library dart.typed_data;
 
 import "dart:_internal";
 import "dart:collection" show ListBase;
 import 'dart:math' show Random;
 
 /**
  * A typed view of a sequence of bytes.
  */
 abstract class TypedData {
@@ skipping 4231 matching lines @@
   }
 }
 
 
 int _defaultIfNull(object, value) {
   if (object == null) {
     return value;
   }
   return object;
 }