1. Check that ClassicPendingScript is not accessed after prefinalizer explicitly

third_party/WebKit/Source/core/dom/ClassicPendingScript.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ClassicPendingScript_h
 #define ClassicPendingScript_h
 
 #include "bindings/core/v8/ScriptStreamer.h"
 #include "core/dom/ClassicScript.h"
 #include "core/dom/PendingScript.h"
@@ skipping 68 matching lines @@
   void NotifyFinished(Resource*) override;
   String DebugName() const override { return "PendingScript"; }
   void NotifyAppendData(ScriptResource*) override;
 
   // MemoryCoordinatorClient
   void OnPurgeMemory() override;
 
   bool integrity_failure_;
 
   Member<ScriptStreamer> streamer_;
+
+  // This is a temporary flag to confirm that ClassicPendingScript is not
+  // touched after its refinalizer call and thus https://crbug.com/715309
+  // doesn't break assumptions.
+  // TODO(hiroshige): Check the state in more general way.
+  bool prefinalizer_called_ = false;
 };
 
 }  // namespace blink
 
 #endif  // PendingScript_h