Uses a finalizer to delete zlib filter resources

runtime/bin/filter.h

Index: runtime/bin/filter.h
diff --git a/runtime/bin/filter.h b/runtime/bin/filter.h
index 2dad3cacb74bfdb37b2d89ddc34b5d0bf1a107b3..85592ab97a1e867881debe39098b56745486e6ba 100644
--- a/runtime/bin/filter.h
+++ b/runtime/bin/filter.h
@@ -29,10 +29,11 @@ class Filter {
   virtual intptr_t Processed(uint8_t* buffer, intptr_t length, bool finish,
                              bool end) = 0;
 
-  static Dart_Handle SetFilterPointerNativeField(Dart_Handle filter,
-                                                 Filter* filter_pointer);
-  static Dart_Handle GetFilterPointerNativeField(Dart_Handle filter,
-                                                 Filter** filter_pointer);
+  static Dart_Handle SetFilterAndCreateFinalizer(Dart_Handle filter,
+                                                 Filter* filter_pointer,
+                                                 intptr_t filter_size);
+  static Dart_Handle GetFilterNativeField(Dart_Handle filter,
+                                          Filter** filter_pointer);
 
   bool initialized() const { return initialized_; }
   void set_initialized(bool value) { initialized_ = value; }