Refactor ResourceLoadPriorityOptimizer to avoid walking render tree

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 77b99b30e0ff38e48b956bd8632a847308beca28..cf8c2093e6ad4349c774d27936723ccae1d2e111 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -2860,18 +2860,6 @@ void RenderObject::scheduleRelayout()
     }
 }
 
-void RenderObject::didLayout(ResourceLoadPriorityOptimizer& priorityModifier)
-{
-    for (RenderObject* child = firstChild(); child; child = child->nextSibling())
-        child->didLayout(priorityModifier);
-}
-
-void RenderObject::didScroll(ResourceLoadPriorityOptimizer& priorityModifier)
-{
-    for (RenderObject* child = firstChild(); child; child = child->nextSibling())
-        child->didScroll(priorityModifier);
-}
-
 void RenderObject::forceLayout()
 {
     setSelfNeedsLayout(true);