Update stale links to dvcs.w3.org

third_party/WebKit/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.
@@ skipping 1501 matching lines @@
 void Document::setDir(const AtomicString& value) {
   Element* rootElement = documentElement();
   if (isHTMLHtmlElement(rootElement))
     toHTMLHtmlElement(rootElement)->setDir(value);
 }
 
 PageVisibilityState Document::pageVisibilityState() const {
   // The visibility of the document is inherited from the visibility of the
   // page. If there is no page associated with the document, we will assume
   // that the page is hidden, as specified by the spec:
-  // http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#dom-document-hidden
+  // https://w3c.github.io/page-visibility/#hidden-attribute
   if (!m_frame || !m_frame->page())
     return PageVisibilityStateHidden;
   // While visibilitychange is being dispatched during unloading it is
   // expected that the visibility is hidden regardless of the page's
   // visibility.
   if (m_loadEventProgress >= UnloadVisibilityChangeInProgress)
     return PageVisibilityStateHidden;
   return m_frame->page()->visibilityState();
 }
 
@@ skipping 5039 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif