Prefer ComposedTreeTraversal to NodeRenderingTraversal.

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 574745427d842db534640170fb002ebe0b69f0d0..2dc32050c08919b9376658e68b91add6afe3c7e4 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -47,7 +47,6 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/LiveNodeList.h"
 #include "core/dom/NodeRareData.h"
-#include "core/dom/NodeRenderingTraversal.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/Range.h"
@@ -795,7 +794,7 @@ bool Node::shouldHaveFocusAppearance() const
 bool Node::isInert() const
 {
     const HTMLDialogElement* dialog = document().activeModalDialog();
-    if (dialog && this != document() && !NodeRenderingTraversal::contains(*dialog, *this))
+    if (dialog && this != document() && canParticipateInComposedTree() && !ComposedTreeTraversal::contains(*dialog, *this))

[kochi, 2015/04/09 05:01:47]

(Just a comment)
This looks somewhat tricky as other parts are mechanical replacement, while
this CTT::contains() you have to take care that the target element should meet
canParticipateInComposedTree() condition.
It should be okay because that condition is caugut in CTT::contains() as
assertPrecondition().

[hayato, 2015/04/09 05:35:01]

Acknowledged. 
canParticipateInComposedTree() is necessary here to avoid hitting assertion
because Node::isInert might be called for (active) insertion points.

         return true;
     return document().ownerElement() && document().ownerElement()->isInert();
 }
@@ -1820,7 +1819,7 @@ void Node::showTreeForThisAcrossFrame() const
 
 Element* Node::enclosingLinkEventParentOrSelf()
 {
-    for (Node* node = this; node; node = NodeRenderingTraversal::parent(*node)) {
+    for (Node* node = this; node; node = ComposedTreeTraversal::parent(*node)) {
         // For imagemaps, the enclosing link node is the associated area element not the image itself.
         // So we don't let images be the enclosingLinkNode, even though isLink sometimes returns true
         // for them.