[Editing][CodeHealth] Make Node::rootEditableElement static

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 772 matching lines @@
 
     if (isBody() || isDocumentElement() || hasOverflowClip()
         || isPositioned() || isFloating()
         || isTableCell() || isInlineBlockOrInlineTable()
         || hasTransformRelatedProperty() || hasReflection() || hasMask() || isWritingModeRoot()
         || isLayoutFlowThread() || isFlexItemIncludingDeprecated())
         return true;
 
     if (view() && view()->selectionStart()) {
         Node* startElement = view()->selectionStart()->node();
-        if (startElement && startElement->rootEditableElement() == node())
+        if (startElement && rootEditableElement(*startElement) == node())
             return true;
     }
 
     return false;
 }
 
 LayoutUnit LayoutBlock::blockDirectionOffset(const LayoutSize& offsetFromBlock) const
 {
     return isHorizontalWritingMode() ? offsetFromBlock.height() : offsetFromBlock.width();
 }
@@ skipping 598 matching lines @@
         else if (computedInlineSize.isMinContent())
             maxPreferredLogicalWidth = minPreferredLogicalWidth;
     }
 }
 
 bool LayoutBlock::hasLineIfEmpty() const
 {
     if (!node())
         return false;
 
-    if (node()->isRootEditableElement())
+    if (isRootEditableElement(*node()))
         return true;
 
     if (node()->isShadowRoot() && isHTMLInputElement(toShadowRoot(node())->host()))
         return true;
 
     return false;
 }
 
 LayoutUnit LayoutBlock::lineHeight(bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
 {
@@ skipping 443 matching lines @@
         for (TrackedLayoutBoxListHashSet::const_iterator it = positionedDescendantSet->begin(); it != end; ++it) {
             LayoutBox* currBox = *it;
             ASSERT(!currBox->needsLayout());
         }
     }
 }
 
 #endif
 
 } // namespace blink