Add Traversal<*Element>::firstAncestor() API

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 e6e9ba7dd2d924a948810eb49b63cea2e2e36ec5..a13c4af7cd30784944663d9f79b8f760412312ab 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -2958,8 +2958,8 @@ PassRefPtr<RenderStyle> RenderObject::getUncachedPseudoStyle(const PseudoStyleRe
 
     // FIXME: This "find nearest element parent" should be a helper function.
     Node* n = node();
-    while (n && !n->isElementNode())
-        n = n->parentNode();
+    if (n && !n->isElementNode())
+        n = ElementTraversal::firstAncestor(*n);

[esprehn, 2014/03/21 07:58:33]

This just makes this code slower and more complicated. You only ever need to go
one level to get from a Node to an Element.

[Inactive, 2014/03/21 14:37:24]

Kept this change out.

     if (!n)
         return nullptr;
     Element* element = toElement(n);