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

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 33281)
+++ runtime/vm/object.h	(working copy)
@@ -2345,7 +2345,9 @@
   void SetPrivateKey(const String& value) const;
 
   static RawTokenStream* New();
-  static void DataFinalizer(Dart_WeakPersistentHandle handle, void *peer);
+  static void DataFinalizer(Dart_Isolate isolate,
+                            Dart_WeakPersistentHandle handle,
+                            void *peer);
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(TokenStream, Object);
   friend class Class;
@@ -5288,7 +5290,9 @@
                       void* peer,
                       Dart_PeerFinalizer cback);
 
-  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+  static void Finalize(Dart_Isolate isolate,
+                       Dart_WeakPersistentHandle handle,
+                       void* peer);
 
   static const ClassId kClassId = kOneByteStringCid;
 
@@ -5379,7 +5383,9 @@
                       void* peer,
                       Dart_PeerFinalizer cback);
 
-  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+  static void Finalize(Dart_Isolate isolate,
+                       Dart_WeakPersistentHandle handle,
+                       void* peer);
 
   static RawTwoByteString* null() {
     return reinterpret_cast<RawTwoByteString*>(Object::null());
@@ -5472,7 +5478,9 @@
     raw_ptr(str)->external_data_ = data;
   }
 
-  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+  static void Finalize(Dart_Isolate isolate,
+                       Dart_WeakPersistentHandle handle,
+                       void* peer);
 
   static RawExternalOneByteString* ReadFrom(SnapshotReader* reader,
                                             intptr_t object_id,
@@ -5543,7 +5551,9 @@
     raw_ptr(str)->external_data_ = data;
   }
 
-  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+  static void Finalize(Dart_Isolate isolate,
+                       Dart_WeakPersistentHandle handle,
+                       void* peer);
 
   static RawExternalTwoByteString* ReadFrom(SnapshotReader* reader,
                                             intptr_t object_id,