1. Check that ClassicPendingScript is not accessed after prefinalizer explicitly

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

Index: third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp
diff --git a/third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp b/third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp
index 17de68f72fe09fdad6943ec057ccf2a78e00ed93..e1c747e4e89d3a3c93f5b5fbca2ec03ba70c4d6c 100644
--- a/third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp
+++ b/third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp
@@ -41,6 +41,7 @@ ClassicPendingScript::~ClassicPendingScript() {}
 
 NOINLINE void ClassicPendingScript::CheckState() const {
   // TODO(hiroshige): Turn these CHECK()s into DCHECK() before going to beta.
+  CHECK(!prefinalizer_called_);
   CHECK(GetElement());
   CHECK(GetResource() || !streamer_);
   CHECK(!streamer_ || streamer_->GetResource() == GetResource());
@@ -48,6 +49,7 @@ NOINLINE void ClassicPendingScript::CheckState() const {
 
 NOINLINE void ClassicPendingScript::Dispose() {
   PendingScript::Dispose();
+  prefinalizer_called_ = true;
 }
 
 void ClassicPendingScript::DisposeInternal() {