Node.contains should return true for nodes in Shadow DOM.

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 24338a14e45ed19e2864ac17a805fad0a5938c42..4f45fc7f47a41a55c7c924e0821189e45831dec9 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -517,6 +517,9 @@ public:
     bool containsIncludingShadowDOM(const Node*) const;
     bool containsIncludingHostElements(const Node*) const;
 
+    // FIXME: Remove this when crbug.com/265716 cleans up contains semantics.
+    bool bindingsContains(const Node* node) const { return containsIncludingShadowDOM(node); }
+
     // Used to determine whether range offsets use characters or node indices.
     virtual bool offsetInCharacters() const;
     // Number of DOM 16-bit units contained in node. Note that rendered text length can be different - e.g. because of