Get rid of loops looking for the first Element ancestor

Source/core/rendering/TextAutosizer.cpp

Index: Source/core/rendering/TextAutosizer.cpp
diff --git a/Source/core/rendering/TextAutosizer.cpp b/Source/core/rendering/TextAutosizer.cpp
index 5b3581404bab4d5323dfa210328611c6d40afa7e..6d4807248c2e1b58070cd7b131cf1244daec8113 100644
--- a/Source/core/rendering/TextAutosizer.cpp
+++ b/Source/core/rendering/TextAutosizer.cpp
@@ -121,10 +121,9 @@ static const RenderObject* parentElementRenderer(const RenderObject* renderer)
     if (!node)
         return 0;
 
-    for (node = node->parentNode(); node; node = node->parentNode()) {
-        if (node->isElementNode())
-            return node->renderer();
-    }
+    // FIXME: This should be using NodeRenderingTraversal::parent().
+    if (Element* parent = node->parentElement())
+        return parent->renderer();
     return 0;
 }