Remove the MSAA WebSetting, which is not read or used.

third_party/WebKit/Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 193 matching lines @@
     // Should only be called during initialization or swaps between local and
     // remote frames.
     // FIXME: Unfortunately we can't assert on this at the moment, because this
     // is called in the base constructor for both LocalFrame and RemoteFrame,
     // when the vtables for the derived classes have not yet been setup.
     m_mainFrame = mainFrame;
 }
 
 void Page::documentDetached(Document* document)
 {
-    m_multisamplingChangedObservers.clear();
     m_pointerLockController->documentDetached(document);
     m_contextMenuController->documentDetached(document);
     if (m_validationMessageClient)
         m_validationMessageClient->documentDetached(*document);
     m_originsUsingFeatures.documentDetached(*document);
 }
 
 bool Page::openedByDOM() const
 {
     return m_openedByDOM;
@@ skipping 158 matching lines @@
 bool Page::isPageVisible() const
 {
     return visibilityState() == PageVisibilityStateVisible;
 }
 
 bool Page::isCursorVisible() const
 {
     return m_isCursorVisible && settings().deviceSupportsMouse();
 }
 
-void Page::addMultisamplingChangedObserver(MultisamplingChangedObserver* observer)
-{
-    m_multisamplingChangedObservers.add(observer);
-}
-
-// For Oilpan, unregistration is handled by the GC and weak references.
-#if !ENABLE(OILPAN)
-void Page::removeMultisamplingChangedObserver(MultisamplingChangedObserver* observer)
-{
-    m_multisamplingChangedObservers.remove(observer);
-}
-#endif
-
 void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
 {
     switch (changeType) {
     case SettingsDelegate::StyleChange:
         setNeedsRecalcStyleInAllFrames();
         break;
     case SettingsDelegate::ViewportDescriptionChange:
         if (mainFrame() && mainFrame()->isLocalFrame())
             deprecatedLocalMainFrame()->document()->updateViewportDescription();
         break;
     case SettingsDelegate::DNSPrefetchingChange:
         for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame())
                 toLocalFrame(frame)->document()->initDNSPrefetch();
         }
         break;
-    case SettingsDelegate::MultisamplingChange: {
-        for (MultisamplingChangedObserver* observer : m_multisamplingChangedObservers)
-            observer->multisamplingChanged(m_settings->openGLMultisamplingEnabled());
-        break;
-    }
     case SettingsDelegate::ImageLoadingChange:
         for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame()) {
                 toLocalFrame(frame)->document()->fetcher()->setImagesEnabled(settings().imagesEnabled());
                 toLocalFrame(frame)->document()->fetcher()->setAutoLoadImages(settings().loadsImagesAutomatically());
             }
         }
         break;
     case SettingsDelegate::TextAutosizingChange:
         if (!mainFrame() || !mainFrame()->isLocalFrame())
@@ skipping 94 matching lines @@
     visitor->trace(m_chromeClient);
     visitor->trace(m_dragCaretController);
     visitor->trace(m_dragController);
     visitor->trace(m_focusController);
     visitor->trace(m_contextMenuController);
     visitor->trace(m_pointerLockController);
     visitor->trace(m_scrollingCoordinator);
     visitor->trace(m_undoStack);
     visitor->trace(m_mainFrame);
     visitor->trace(m_validationMessageClient);
-    visitor->trace(m_multisamplingChangedObservers);
     visitor->trace(m_frameHost);
     visitor->trace(m_memoryPurgeController);
     Supplementable<Page>::trace(visitor);
     PageLifecycleNotifier::trace(visitor);
     MemoryPurgeClient::trace(visitor);
 }
 
 void Page::layerTreeViewInitialized(WebLayerTreeView& layerTreeView)
 {
     if (scrollingCoordinator())
@@ skipping 52 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT Supplement<Page>;
 
 } // namespace blink