Improve support for :read-only and :read-write pseudoclasses.

Source/core/html/HTMLElement.h

Index: Source/core/html/HTMLElement.h
diff --git a/Source/core/html/HTMLElement.h b/Source/core/html/HTMLElement.h
index 9d94c2488fcb1e5214d95194a2b0a95b6eb81f74..09e5f919c218529d777fb8ad5ae83948afe6de38 100644
--- a/Source/core/html/HTMLElement.h
+++ b/Source/core/html/HTMLElement.h
@@ -87,6 +87,9 @@ public:
 
     static const AtomicString& eventNameForAttributeName(const QualifiedName& attrName);
 
+    virtual bool matchesReadOnlyPseudoClass() const OVERRIDE;
+    virtual bool matchesReadWritePseudoClass() const OVERRIDE;
+
 protected:
     HTMLElement(const QualifiedName& tagName, Document&, ConstructionType);