Remove WTF::static_pointer_cast functions.

third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h

Index: third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h
diff --git a/third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h b/third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h
index d7d0e02293ba184666f1e3fdda10560cd8d38f1f..5fd3153229c6eb9b85bd15d0b3133a015c59ab0b 100644
--- a/third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h
+++ b/third_party/WebKit/Source/core/svg/properties/SVGListPropertyHelper.h
@@ -37,7 +37,6 @@
 #include "core/svg/SVGAnimationElement.h"
 #include "core/svg/properties/SVGPropertyHelper.h"
 #include "wtf/Allocator.h"
-#include "wtf/PassRefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
@@ -171,14 +170,6 @@ private:
     size_t findItem(ItemPropertyType*);
 
     HeapVector<Member<ItemPropertyType>> m_values;
-
-    static Derived* toDerived(SVGPropertyBase* base)
-    {
-        if (!base)
-            return nullptr;
-        ASSERT(base->type() == Derived::classType());
-        return static_pointer_cast<Derived>(base);
-    }
 };
 
 template<typename Derived, typename ItemProperty>