Revert 183623 "Fix fullscreen elements in pinch viewport mode."

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 15 matching lines @@
 
 #include "config.h"
 #include "core/frame/FrameView.h"
 
 #include "core/HTMLNames.h"
 #include "core/MediaTypeNames.h"
 #include "core/accessibility/AXObjectCache.h"
 #include "core/css/FontFaceSet.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/DocumentMarkerController.h"
-#include "core/dom/Fullscreen.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/RenderedPosition.h"
 #include "core/events/OverflowEvent.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameElement.h"
 #include "core/html/HTMLPlugInElement.h"
@@ skipping 3674 matching lines @@
 
 void FrameView::positionScrollbarLayers()
 {
     positionScrollbarLayer(layerForHorizontalScrollbar(), horizontalScrollbar());
     positionScrollbarLayer(layerForVerticalScrollbar(), verticalScrollbar());
     positionScrollCornerLayer(layerForScrollCorner(), scrollCornerRect());
 }
 
 bool FrameView::userInputScrollable(ScrollbarOrientation orientation) const
 {
-    Document* document = frame().document();
-    Element* fullscreenElement = Fullscreen::fullscreenElementFrom(*document);
-    if (fullscreenElement && fullscreenElement != document->documentElement())
-        return false;
-
     ScrollbarMode mode = (orientation == HorizontalScrollbar) ?
         m_horizontalScrollbarMode : m_verticalScrollbarMode;
 
     return mode == ScrollbarAuto || mode == ScrollbarAlwaysOn;
 }
 
 bool FrameView::shouldPlaceVerticalScrollbarOnLeft() const
 {
     return false;
 }
@@ skipping 257 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffsetDouble());
 }
 
 } // namespace blink