Dart2js: Make Int64List and Uint64List abstract.

sdk/lib/typed_data/dart2js/typed_data_dart2js.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.
 
 /**
  * Specialized integers and floating point numbers,
  * with SIMD support and efficient lists.
  */
 library dart.typed_data;
 
@@ skipping 1107 matching lines @@
   static Uint8List _create3(arg1, arg2, arg3) =>
       JS('Uint8List', 'new Uint8Array(#, #, #)', arg1, arg2, arg3);
 }
 
 
 /**
  * A fixed-length list of 64-bit signed integers that is viewable as a
  * [TypedData]. For long lists, this implementation can be considerably
  * more space- and time-efficient than the default [List] implementation.
  */
-class Int64List extends TypedData implements JavaScriptIndexingBehavior, List<int> {
+abstract class Int64List extends TypedData
+    implements JavaScriptIndexingBehavior, List<int> {
   /**
    * Creates an [Int64List] of the specified length (in elements), all of
    * whose elements are initially zero.
    */
   factory Int64List(int length) {
     throw new UnsupportedError("Int64List not supported by dart2js.");
   }
 
   /**
    * Creates a [Int64List] with the same size as the [elements] list
@@ skipping 24 matching lines @@
 
   static const int BYTES_PER_ELEMENT = 8;
 }
 
 
 /**
  * A fixed-length list of 64-bit unsigned integers that is viewable as a
  * [TypedData]. For long lists, this implementation can be considerably
  * more space- and time-efficient than the default [List] implementation.
  */
-class Uint64List extends TypedData implements JavaScriptIndexingBehavior, List<int> {
+abstract class Uint64List extends TypedData
+    implements JavaScriptIndexingBehavior, List<int> {
   /**
    * Creates a [Uint64List] of the specified length (in elements), all
    * of whose elements are initially zero.
    */
   factory Uint64List(int length) {
     throw new UnsupportedError("Uint64List not supported by dart2js.");
   }
 
   /**
    * Creates a [Uint64List] with the same size as the [elements] list
@@ skipping 1346 matching lines @@
     int _w = (cmw & stw) | (~cmw & sfw);
     var r = new Float32x4(0.0, 0.0, 0.0, 0.0);
     var rView = new Int32List.view(r._storage.buffer);
     rView[0] = _x;
     rView[1] = _y;
     rView[2] = _z;
     rView[3] = _w;
     return r;
   }
 }