Remove unused Document::getFocusableNodes

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 0bfe2ed0bf463d678fb8a017102ea679066e97ab..870eee8d14adcd2d755b5fb22bb718b7df76b8b0 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -632,8 +632,7 @@ public:
     UserActionElementSet& userActionElements()  { return m_userActionElements; }
     const UserActionElementSet& userActionElements() const { return m_userActionElements; }
     void didRunCheckFocusedNodeTask() { m_didPostCheckFocusedNodeTask = false; }
-    void getFocusableNodes(Vector<RefPtr<Node> >&);
-    
+
     // The m_ignoreAutofocus flag specifies whether or not the document has been changed by the user enough 
     // for WebCore to ignore the autofocus attribute on any form controls
     bool ignoreAutofocus() const { return m_ignoreAutofocus; };