Uses a finalizer to delete zlib filter resources

runtime/bin/filter_patch.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.
 
 
 class _FilterImpl extends NativeFieldWrapperClass1 implements _Filter {
   void process(List<int> data, int start, int end) native "Filter_Process";
 
   List<int> processed({bool flush: true, bool end: false})
       native "Filter_Processed";
-
-  void end() native "Filter_End";
 }
 
 class _ZLibInflateFilter extends _FilterImpl {
   _ZLibInflateFilter(int windowBits, List<int> dictionary, bool raw) {
     _init(windowBits, dictionary, raw);
   }
   void _init(int windowBits, List<int> dictionary, bool raw)
       native "Filter_CreateZLibInflate";
 }
 
@@ skipping 13 matching lines @@
                                                    int strategy,
                                                    List<int> dictionary,
                                                    bool raw) =>
       new _ZLibDeflateFilter(gzip, level, windowBits, memLevel, strategy,
                              dictionary, raw);
   /* patch */ static _Filter _newZLibInflateFilter(int windowBits,
                                                    List<int> dictionary,
                                                    bool raw) =>
       new _ZLibInflateFilter(windowBits, dictionary, raw);
 }