Fix unused functions warnings on Linux.

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 469 matching lines @@
     initDNSPrefetch();
 
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(m_nodeListCounts); i++)
         m_nodeListCounts[i] = 0;
 
     InspectorCounters::incrementCounter(InspectorCounters::DocumentCounter);
 
     m_lifecyle.advanceTo(DocumentLifecycle::Inactive);
 }
 
-static bool isAttributeOnAllOwners(const WebCore::QualifiedName& attribute, const WebCore::QualifiedName& prefixedAttribute, const HTMLFrameOwnerElement* owner)
-{
-    if (!owner)
-        return true;
-    do {
-        if (!(owner->hasAttribute(attribute) || owner->hasAttribute(prefixedAttribute)))
-            return false;
-    } while ((owner = owner->document().ownerElement()));
-    return true;
-}
-
 Document::~Document()
 {
     ASSERT(!renderer());
     ASSERT(m_ranges.isEmpty());
     ASSERT(!m_parentTreeScope);
     ASSERT(!hasGuardRefCount());
 
     if (m_templateDocument)
         m_templateDocument->setTemplateDocumentHost(0); // balanced in templateDocument().
 
@@ skipping 4767 matching lines @@
 void Document::modifiedStyleSheet(StyleSheet* sheet, RecalcStyleTime when, StyleResolverUpdateMode updateMode)
 {
     if (!isActive())
         return;
 
     styleEngine()->modifiedStyleSheet(sheet);
     styleResolverChanged(when, updateMode);
 }
 
 } // namespace WebCore