Fix Document leak from NodeFilter.

Source/bindings/v8/custom/V8TreeWalkerCustom.cpp

Index: Source/bindings/v8/custom/V8TreeWalkerCustom.cpp
diff --git a/Source/bindings/v8/custom/V8TreeWalkerCustom.cpp b/Source/bindings/v8/custom/V8TreeWalkerCustom.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5b60189c8703912bcd8065a5fade3f39849b6a7a
--- /dev/null
+++ b/Source/bindings/v8/custom/V8TreeWalkerCustom.cpp
@@ -0,0 +1,28 @@
+#include "config.h"

[haraken, 2013/08/01 13:32:20]

Please add a copyright.

[kouhei (in TOK), 2013/08/02 03:26:57]

Done.

+#include "V8TreeWalker.h"
+
+#include "V8NodeFilter.h"
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8HiddenPropertyName.h"
+#include "bindings/v8/V8Utilities.h"
+#include "core/dom/Node.h"
+#include "core/dom/TreeWalker.h"
+
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+v8::Handle<v8::Object> wrap(TreeWalker* treeWalker, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    ASSERT(treeWalker);
+    ASSERT(DOMDataStore::getWrapper<V8TreeWalker>(treeWalker, isolate).IsEmpty());
+
+    v8::Handle<v8::Object> wrapper = V8TreeWalker::createWrapper(treeWalker, creationContext, isolate);
+
+    if (treeWalker->filter())
+        V8HiddenPropertyName::setNamedHiddenReference(wrapper, "filter", toV8(treeWalker->filter(), creationContext, isolate));
+
+    return wrapper;
+}
+
+} // namespace WebCore