Revert "Remove resetScrollbars"

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 138 matching lines @@
 
 FrameView::~FrameView()
 {
     if (m_postLayoutTasksTimer.isActive())
         m_postLayoutTasksTimer.stop();
 
     if (m_didScrollTimer.isActive())
         m_didScrollTimer.stop();
 
     removeFromAXObjectCache();
+    resetScrollbars();
 
     // Custom scrollbars should already be destroyed at this point
     ASSERT(!horizontalScrollbar() || !horizontalScrollbar()->isCustomScrollbar());
     ASSERT(!verticalScrollbar() || !verticalScrollbar()->isCustomScrollbar());
 
     setHasHorizontalScrollbar(false); // Remove native scrollbars now before we lose the connection to the HostWindow.
     setHasVerticalScrollbar(false);
 
     ASSERT(!m_scrollCorner);
 
@@ skipping 36 matching lines @@
     m_maintainScrollPositionAnchor = nullptr;
     m_viewportConstrainedObjects.clear();
 }
 
 void FrameView::removeFromAXObjectCache()
 {
     if (AXObjectCache* cache = axObjectCache())
         cache->remove(this);
 }
 
+void FrameView::resetScrollbars()
+{
+    // Reset the document's scrollbars back to our defaults before we yield the floor.
+    m_firstLayout = true;
+    setScrollbarsSuppressed(true);
+    if (m_canHaveScrollbars)
+        setScrollbarModes(ScrollbarAuto, ScrollbarAuto);
+    else
+        setScrollbarModes(ScrollbarAlwaysOff, ScrollbarAlwaysOff);
+    setScrollbarsSuppressed(false);
+}
+
 void FrameView::init()
 {
     reset();
 
     m_size = LayoutSize();
 
     // Propagate the marginwidth/height and scrolling modes to the view.
     // FIXME: Do we need to do this for OOPI?
     Element* ownerElement = m_frame->deprecatedLocalOwner();
     if (ownerElement && (isHTMLFrameElement(*ownerElement) || isHTMLIFrameElement(*ownerElement))) {
@@ skipping 2775 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace blink