Oilpan: move ScriptLoader to the heap.

Source/core/html/HTMLScriptElement.h

Index: Source/core/html/HTMLScriptElement.h
diff --git a/Source/core/html/HTMLScriptElement.h b/Source/core/html/HTMLScriptElement.h
index f829b6d1db1fe844eea2c7921fa4d2dfbab34470..21a1396d194795e01c9ef87b5d35111b7622344b 100644
--- a/Source/core/html/HTMLScriptElement.h
+++ b/Source/core/html/HTMLScriptElement.h
@@ -46,6 +46,8 @@ public:
 
     ScriptLoader* loader() const { return m_loader.get(); }
 
+    virtual void trace(Visitor*) override;
+
 private:
     HTMLScriptElement(Document&, bool wasInsertedByParser, bool alreadyStarted);
 
@@ -74,7 +76,7 @@ private:
 
     virtual PassRefPtrWillBeRawPtr<Element> cloneElementWithoutAttributesAndChildren() override;
 
-    OwnPtr<ScriptLoader> m_loader;
+    OwnPtrWillBeMember<ScriptLoader> m_loader;
 };
 
 } // namespace blink