[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

third_party/WebKit/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 2285 matching lines @@
 
 void FrameView::scrollbarVisibilityChanged()
 {
     LayoutViewItem viewItem = layoutViewItem();
     if (!viewItem.isNull())
         viewItem.clearHitTestCache();
 }
 
 IntRect FrameView::scrollableAreaBoundingBox() const
 {
-    LayoutPart* ownerLayoutObject = frame().ownerLayoutObject();
-    if (!ownerLayoutObject)
+    LayoutPartItem ownerLayoutItem = frame().ownerLayoutItem();
+    if (ownerLayoutItem.isNull())
         return frameRect();
 
-    return ownerLayoutObject->absoluteContentQuad().enclosingBoundingBox();
+    return ownerLayoutItem.absoluteContentQuad().enclosingBoundingBox();
 }
 
 
 bool FrameView::isScrollable()
 {
     return getScrollingReasons() == Scrollable;
 }
 
 bool FrameView::isProgrammaticallyScrollable()
 {
@@ skipping 2032 matching lines @@
 }
 
 bool FrameView::canThrottleRendering() const
 {
     if (!RuntimeEnabledFeatures::renderingPipelineThrottlingEnabled())
         return false;
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 } // namespace blink