Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderFileUploadControl.h

Index: Source/core/rendering/RenderFileUploadControl.h
diff --git a/Source/core/rendering/RenderFileUploadControl.h b/Source/core/rendering/RenderFileUploadControl.h
index acc97136ed219b3cdde1259f57fbfaa3cf42f3c0..f3dfcf34b8ee029a6ff3b6d7b4d003e2c4abc3a0 100644
--- a/Source/core/rendering/RenderFileUploadControl.h
+++ b/Source/core/rendering/RenderFileUploadControl.h
@@ -63,20 +63,7 @@ private:
     bool m_canReceiveDroppedFiles;
 };
 
-inline RenderFileUploadControl* toRenderFileUploadControl(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFileUploadControl());
-    return static_cast<RenderFileUploadControl*>(object);
-}
-
-inline const RenderFileUploadControl* toRenderFileUploadControl(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFileUploadControl());
-    return static_cast<const RenderFileUploadControl*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderFileUploadControl(const RenderFileUploadControl*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFileUploadControl, isFileUploadControl());
 
 } // namespace WebCore