Add UseCounters for the Attr.value getter and setter

Source/core/dom/Attr.h

Index: Source/core/dom/Attr.h
diff --git a/Source/core/dom/Attr.h b/Source/core/dom/Attr.h
index 579a5d86465df167fa5702a4afce331e8374e0e6..6647ca5dc3653b6418a87efbb8b966f434a74cac 100644
--- a/Source/core/dom/Attr.h
+++ b/Source/core/dom/Attr.h
@@ -49,9 +49,11 @@ public:
     Element* ownerElement() const { return m_element; }
 
     const AtomicString& value() const;
-    void setValue(const AtomicString&, ExceptionState&);
     void setValue(const AtomicString&);
 
+    const AtomicString& valueForBindings() const;
+    void setValueForBindings(const AtomicString&);
+
     const QualifiedName& qualifiedName() const { return m_name; }
 
     void attachToElement(Element*);
@@ -67,6 +69,8 @@ private:
 
     void createTextChild();
 
+    void setValueInternal(const AtomicString&);
+
     virtual String nodeName() const OVERRIDE { return name(); }
     virtual NodeType nodeType() const OVERRIDE { return ATTRIBUTE_NODE; }