Make List.from and Iterable.toList default to not growable.

runtime/lib/byte_array.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.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
 
   /* patch */ factory Int8List.transferable(int length) {
@@ skipping 389 matching lines @@
   ByteArray asByteArray([int start = 0, int length]) {
     if (length == null) {
       length = this.length;
     }
     _rangeCheck(this.length, start, length);
     return new _ByteArrayView(this,
                               start * this.bytesPerElement(),
                               length * this.bytesPerElement());
   }
 
-  List<int> toList({ bool growable: false }) {
+  List<int> toList({ bool growable: true }) {
     return new List<int>.from(this, growable: growable);
   }
 
   Set<int> toSet() {
     return new Set<int>.from(this);
   }
 
   int _length() native "ByteArray_getLength";
 
   void _setRange(int startInBytes, int lengthInBytes,
@@ skipping 2282 matching lines @@
   ByteArray asByteArray([int start = 0, int length]) {
     if (length == null) {
       length = this.lengthInBytes();
     }
     _rangeCheck(this.length, start, length);
     return _array.subByteArray(_offset + start, length);
   }
 
   static const int _BYTES_PER_ELEMENT = 8;
 }