Rewrite references to "wtf/" to "platform/wtf/" in core/paint.

third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp b/third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp
index bb74f1fc0817e704915c857f67a70d8c30e1e6a9..3ec42678448e892449c596f63eedee803c264d6f 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerStackingNode.cpp
@@ -44,14 +44,14 @@
 
 #include "core/paint/PaintLayerStackingNode.h"
 
+#include <algorithm>
+#include <memory>
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/paint/PaintLayer.h"
+#include "platform/wtf/PtrUtil.h"
 #include "public/platform/Platform.h"
-#include "wtf/PtrUtil.h"
-#include <algorithm>
-#include <memory>
 
 namespace blink {