Oilpan: move ScriptLoader to the heap.

Source/core/svg/SVGScriptElement.h

Index: Source/core/svg/SVGScriptElement.h
diff --git a/Source/core/svg/SVGScriptElement.h b/Source/core/svg/SVGScriptElement.h
index cd32c6597e0eb84f5265574a6eb580ac7b8b27e6..3b728a17568858cc14265b0a2b4551dfd636fdf5 100644
--- a/Source/core/svg/SVGScriptElement.h
+++ b/Source/core/svg/SVGScriptElement.h
@@ -46,6 +46,8 @@ public:
     virtual bool isAnimatableAttribute(const QualifiedName&) const override;
 #endif
 
+    virtual void trace(Visitor*) override;
+
 private:
     SVGScriptElement(Document&, bool wasInsertedByParser, bool alreadyStarted);
     virtual ~SVGScriptElement();
@@ -80,9 +82,8 @@ private:
 
     virtual Timer<SVGElement>* svgLoadEventTimer() override { return &m_svgLoadEventTimer; }
 
-
     Timer<SVGElement> m_svgLoadEventTimer;
-    OwnPtr<ScriptLoader> m_loader;
+    OwnPtrWillBeMember<ScriptLoader> m_loader;
 };
 
 } // namespace blink