EventSender<T> singletons are better off on the Oilpan heap.

third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp b/third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp
index 920052643777d9a0a7f9570e23b0622f097e686b..3ef235336ddb72d7b56ae287c20d55df8ca11d95 100644
--- a/third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLDetailsElement.cpp
@@ -73,8 +73,8 @@ private:
 
 static DetailsEventSender& detailsToggleEventSender()
 {
-    DEFINE_STATIC_LOCAL(DetailsEventSender, sharedToggleEventSender, (EventTypeNames::toggle));
-    return sharedToggleEventSender;
+    DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<DetailsEventSender>, sharedToggleEventSender, (DetailsEventSender::create(EventTypeNames::toggle)));
+    return *sharedToggleEventSender;
 }
 
 PassRefPtrWillBeRawPtr<HTMLDetailsElement> HTMLDetailsElement::create(Document& document)
@@ -93,7 +93,9 @@ HTMLDetailsElement::HTMLDetailsElement(Document& document)
 
 HTMLDetailsElement::~HTMLDetailsElement()
 {
+#if !ENABLE(OILPAN)
     detailsToggleEventSender().cancelEvent(this);
+#endif
 }
 
 void HTMLDetailsElement::dispatchPendingEvent(DetailsEventSender* eventSender)