[Layout API] Use FrameView::layoutViewItem() in LayoutTreeAsText.cpp

third_party/WebKit/Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 521 matching lines @@
     for (LayoutObject* child = o.slowFirstChild(); child; child = child->nextSibling()) {
         if (child->hasLayer())
             continue;
         write(ts, *child, indent + 1, behavior);
     }
 
     if (o.isLayoutPart()) {
         Widget* widget = toLayoutPart(o).widget();
         if (widget && widget->isFrameView()) {
             FrameView* view = toFrameView(widget);
-            LayoutView* root = view->layoutView();
-            if (root) {
-                root->document().updateStyleAndLayout();
-                PaintLayer* layer = root->layer();
+            LayoutViewItem rootItem = view->layoutViewItem();
+            if (!rootItem.isNull()) {
+                rootItem.updateStyleAndLayout();
+                PaintLayer* layer = rootItem.layer();
                 if (layer)
                     LayoutTreeAsText::writeLayers(ts, layer, layer, layer->rect(), indent + 1, behavior);
             }
         }
     }
 }
 
 enum LayerPaintPhase {
     LayerPaintPhaseAll = 0,
     LayerPaintPhaseBackground = -1,
@@ skipping 290 matching lines @@
     element->document().updateStyleAndLayout();
 
     LayoutObject* layoutObject = element->layoutObject();
     if (!layoutObject || !layoutObject->isListItem())
         return String();
 
     return toLayoutListItem(layoutObject)->markerText();
 }
 
 } // namespace blink