Remove a bunch of dead code from RenderLayer

sky/engine/core/dom/Element.cpp

Index: sky/engine/core/dom/Element.cpp
diff --git a/sky/engine/core/dom/Element.cpp b/sky/engine/core/dom/Element.cpp
index 07faae587f8de97610555c8dbf6b1770f2db0573..fe8bfd40b8c84f4d7d9a8c97405e34c05c96cdd0 100644
--- a/sky/engine/core/dom/Element.cpp
+++ b/sky/engine/core/dom/Element.cpp
@@ -1023,18 +1023,6 @@ void Element::setNeedsAnimationStyleRecalc()
     setAnimationStyleChange(true);
 }
 
-void Element::setNeedsCompositingUpdate()
-{
-    if (!document().isActive())
-        return;
-    RenderBoxModelObject* renderer = renderBoxModelObject();
-    if (!renderer)
-        return;
-    if (!renderer->hasLayer())
-        return;
-    renderer->layer()->setNeedsCompositingInputsUpdate();
-}
-
 void Element::setCustomElementDefinition(PassRefPtr<CustomElementDefinition> definition)
 {
     if (!hasRareData() && !definition)