Changed EOverflowAnchor to an enum class and renamed its members

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ScrollAnchor.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/UseCounter.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/api/LayoutBoxItem.h"
@@ skipping 122 matching lines @@
   // developers to reason about the anchor node.
   if (candidate->isAnonymous())
     return ExamineResult(Continue);
 
   if (!candidate->isText() && !candidate->isBox())
     return ExamineResult(Skip);
 
   if (!candidateMayMoveWithScroller(candidate, m_scroller))
     return ExamineResult(Skip);
 
-  if (candidate->style()->overflowAnchor() == AnchorNone)
+  if (candidate->style()->overflowAnchor() == EOverflowAnchor::None)
     return ExamineResult(Skip);
 
   LayoutRect candidateRect = relativeBounds(candidate, m_scroller);
   LayoutRect visibleRect =
       scrollerLayoutBoxItem(m_scroller).overflowClipRect(LayoutPoint());
 
   bool occupiesSpace = candidateRect.width() > 0 && candidateRect.height() > 0;
   if (occupiesSpace && visibleRect.intersects(candidateRect)) {
     return ExamineResult(
         visibleRect.contains(candidateRect) ? Return : Constrain,
@@ skipping 176 matching lines @@
 bool ScrollAnchor::refersTo(const LayoutObject* layoutObject) const {
   return m_anchorObject == layoutObject;
 }
 
 void ScrollAnchor::notifyRemoved(LayoutObject* layoutObject) {
   if (m_anchorObject == layoutObject)
     clearSelf();
 }
 
 }  // namespace blink