Remove DocumentVisibilityObserver

sky/engine/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 224 matching lines @@
 
 #ifndef NDEBUG
 typedef HashSet<RawPtr<Document> > WeakDocumentSet;
 static WeakDocumentSet& liveDocumentSet()
 {
     DEFINE_STATIC_LOCAL(OwnPtr<WeakDocumentSet>, set, (adoptPtr(new WeakDocumentSet())));
     return *set;
 }
 #endif
 
-DocumentVisibilityObserver::DocumentVisibilityObserver(Document& document)
-    : m_document(nullptr)
-{
-    registerObserver(document);
-}
-
-DocumentVisibilityObserver::~DocumentVisibilityObserver()
-{
-#if !ENABLE(OILPAN)
-    unregisterObserver();
-#endif
-}
-
-void DocumentVisibilityObserver::unregisterObserver()
-{
-    if (m_document) {
-        m_document->unregisterVisibilityObserver(this);
-        m_document = nullptr;
-    }
-}
-
-void DocumentVisibilityObserver::registerObserver(Document& document)
-{
-    ASSERT(!m_document);
-    m_document = &document;
-    if (m_document)
-        m_document->registerVisibilityObserver(this);
-}
-
-void DocumentVisibilityObserver::setObservedDocument(Document& document)
-{
-    unregisterObserver();
-    registerObserver(document);
-}
-
 Document::Document(const DocumentInit& initializer, DocumentClassFlags documentClasses)
     : ContainerNode(0, CreateDocument)
     , TreeScope(*this)
     , m_module(nullptr)
     , m_hasNodesWithPlaceholderStyle(false)
     , m_evaluateMediaQueriesOnStyleRecalc(false)
     , m_pendingSheetLayout(NoLayoutWithPendingSheets)
     , m_frame(initializer.frame())
     , m_domWindow(m_frame ? m_frame->domWindow() : 0)
     , m_importsController(initializer.importsController())
@@ skipping 54 matching lines @@
 #endif
 }
 
 Document::~Document()
 {
     ASSERT(!renderView());
     ASSERT(!parentTreeScope());
 #if !ENABLE(OILPAN)
     ASSERT(m_ranges.isEmpty());
     ASSERT(!hasGuardRefCount());
-    // With Oilpan, either the document outlives the visibility observers
-    // or the visibility observers and the document die in the same GC round.
-    // When they die in the same GC round, the list of visibility observers
-    // will not be empty on Document destruction.
-    ASSERT(m_visibilityObservers.isEmpty());
 
     if (m_templateDocument)
         m_templateDocument->m_templateDocumentHost = nullptr; // balanced in ensureTemplateDocument().
 
     // FIXME: Oilpan: Not removing event listeners here also means that we do
     // not notify the inspector instrumentation that the event listeners are
     // gone. The Document and all the nodes in the document are gone, so maybe
     // that is OK?
     removeAllEventListenersRecursively();
 
@@ skipping 573 matching lines @@
 }
 
 bool Document::hidden() const
 {
     return pageVisibilityState() != PageVisibilityStateVisible;
 }
 
 void Document::didChangeVisibilityState()
 {
     dispatchEvent(Event::create(EventTypeNames::visibilitychange));
-    // Also send out the deprecated version until it can be removed.
-    dispatchEvent(Event::create(EventTypeNames::webkitvisibilitychange));
-
-    PageVisibilityState state = pageVisibilityState();
-    DocumentVisibilityObserverSet::const_iterator observerEnd = m_visibilityObservers.end();
-    for (DocumentVisibilityObserverSet::const_iterator it = m_visibilityObservers.begin(); it != observerEnd; ++it)
-        (*it)->didChangeVisibilityState(state);
-}
-
-void Document::registerVisibilityObserver(DocumentVisibilityObserver* observer)
-{
-    ASSERT(!m_visibilityObservers.contains(observer));
-    m_visibilityObservers.add(observer);
-}
-
-void Document::unregisterVisibilityObserver(DocumentVisibilityObserver* observer)
-{
-    ASSERT(m_visibilityObservers.contains(observer));
-    m_visibilityObservers.remove(observer);
 }
 
 String Document::nodeName() const
 {
     return "#document";
 }
 
 Node::NodeType Document::nodeType() const
 {
     return DOCUMENT_NODE;
@@ skipping 1987 matching lines @@
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif