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

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index bd59fb0912a240c3515954ccf6bd5cb740765c51..934179687d76401a2fe4d4ebc11843c495cfde19 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -381,22 +381,6 @@ void Isolate::PrintInvokedFunctions() {
 }
 
 
-class FinalizeWeakPersistentHandlesVisitor : public HandleVisitor {
- public:
-  FinalizeWeakPersistentHandlesVisitor() {
-  }
-
-  void VisitHandle(uword addr) {
-    FinalizablePersistentHandle* handle =
-        reinterpret_cast<FinalizablePersistentHandle*>(addr);
-    FinalizablePersistentHandle::Finalize(handle);
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(FinalizeWeakPersistentHandlesVisitor);
-};
-
-
 void Isolate::Shutdown() {
   ASSERT(this == Isolate::Current());
   ASSERT(top_resource() == NULL);
@@ -418,10 +402,6 @@ void Isolate::Shutdown() {
   delete message_handler();
   set_message_handler(NULL);
 
-  // Finalize any weak persistent handles with a non-null referent.
-  FinalizeWeakPersistentHandlesVisitor visitor;
-  api_state()->weak_persistent_handles().VisitHandles(&visitor);
-
   // Dump all accumalated timer data for the isolate.
   timer_list_.ReportTimers();
   if (FLAG_report_usage_count) {