Rename {Author,UserAgent}ShadowRoot to {Open,Closed}ShadowRoot.

Source/core/layout/LayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 875 matching lines @@
         return IntSize(horizontalScrollbarStart(0), box().size().height() - box().borderBottom() - scrollbar->height());
 
     ASSERT_NOT_REACHED();
     return IntSize();
 }
 
 static inline LayoutObject* rendererForScrollbar(LayoutObject& renderer)
 {
     if (Node* node = renderer.node()) {
         if (ShadowRoot* shadowRoot = node->containingShadowRoot()) {
-            if (shadowRoot->type() == ShadowRoot::UserAgentShadowRoot)
+            if (shadowRoot->type() == ShadowRoot::ClosedShadowRoot)
                 return shadowRoot->host()->renderer();
         }
     }
 
     return &renderer;
 }
 
 PassRefPtrWillBeRawPtr<Scrollbar> LayerScrollableArea::createScrollbar(ScrollbarOrientation orientation)
 {
     RefPtrWillBeRawPtr<Scrollbar> widget = nullptr;
@@ skipping 468 matching lines @@
 void LayerScrollableArea::setTopmostScrollChild(Layer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // namespace blink