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

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
===================================================================
--- Source/core/frame/FrameView.cpp	(revision 183995)
+++ Source/core/frame/FrameView.cpp	(working copy)
@@ -33,7 +33,6 @@
 #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"
@@ -3728,11 +3727,6 @@
 
 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;