Revert of Moving HitTest function to DeprecatedPaintLayerStackingNode.

Source/core/paint/DeprecatedPaintLayerStackingNode.h

Index: Source/core/paint/DeprecatedPaintLayerStackingNode.h
diff --git a/Source/core/paint/DeprecatedPaintLayerStackingNode.h b/Source/core/paint/DeprecatedPaintLayerStackingNode.h
index cbdc060ac956cc2aa14f231f1ce6426d632d1e79..4fd6b7c55c2d562b3b7cb43cebb12a9a69502fc5 100644
--- a/Source/core/paint/DeprecatedPaintLayerStackingNode.h
+++ b/Source/core/paint/DeprecatedPaintLayerStackingNode.h
@@ -97,10 +97,6 @@
     void setLayerListMutationAllowed(bool flag) { m_layerListMutationAllowed = flag; }
 #endif
 
-    // The hitTest() method looks for mouse events by walking layers that intersect the point from front to back.
-    bool hitTest(HitTestResult&);
-    bool hitTest(const HitTestRequest&, const HitTestLocation&, HitTestResult&);
-
 private:
     friend class DeprecatedPaintLayerStackingNodeIterator;
     friend class DeprecatedPaintLayerStackingNodeReverseIterator;