Pass in the isolate parameter to the weak persistent callback handler so that

runtime/bin/io_buffer.h

 // 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.
 
 #ifndef BIN_IO_BUFFER_H_
 #define BIN_IO_BUFFER_H_
 
 #include "platform/globals.h"
 
 #include "include/dart_api.h"
@@ skipping 11 matching lines @@
   // Allocate IO buffer storage.
   static uint8_t* Allocate(intptr_t size);
 
   // Function for disposing of IO buffer storage. All backing storage
   // for IO buffers must be freed using this function.
   static void Free(void* buffer) {
     delete[] reinterpret_cast<uint8_t*>(buffer);
   }
 
   // Function for finalizing external byte arrays used as IO buffers.
-  static void Finalizer(Dart_WeakPersistentHandle handle, void* buffer) {
+  static void Finalizer(Dart_Isolate isolate,
+                        Dart_WeakPersistentHandle handle,
+                        void* buffer) {
     Free(buffer);
     if (handle != NULL) {
-      Dart_DeleteWeakPersistentHandle(handle);
+      Dart_DeleteWeakPersistentHandle(isolate, handle);
     }
   }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(IOBuffer);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_IO_BUFFER_H_