Revert "Revert "Finalize reachable weak persistent handles at isolate shutdown.""

runtime/vm/dart_api_state.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 VM_DART_API_STATE_H_
 #define VM_DART_API_STATE_H_
 
 #include "include/dart_api.h"
 
 #include "platform/thread.h"
@@ skipping 162 matching lines @@
   // Overload the raw_ field as a next pointer when adding freed
   // handles to the free list.
   FinalizablePersistentHandle* Next() {
     return reinterpret_cast<FinalizablePersistentHandle*>(raw_);
   }
   void SetNext(FinalizablePersistentHandle* free_list) {
     raw_ = reinterpret_cast<RawObject*>(free_list);
     ASSERT(!raw_->IsHeapObject());
   }
   void FreeHandle(FinalizablePersistentHandle* free_list) {
+    Clear();
     SetNext(free_list);
   }
 
   void Clear() {
     raw_ = Object::null();
     peer_ = NULL;
     callback_ = NULL;
   }
 
   RawObject* raw_;
@@ skipping 480 matching lines @@
           ApiNativeScope::Current()->zone()->GetBaseZone()) {}
   ApiGrowableArray()
       : BaseGrowableArray<T, ValueObject>(
           ApiNativeScope::Current()->zone()->GetBaseZone()) {}
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DART_API_STATE_H_