Remove a redundant layout update from DragCaret.cpp

third_party/WebKit/Source/core/editing/DragCaret.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 54 matching lines @@
   return isRichlyEditablePosition(m_position.position());
 }
 
 void DragCaret::setCaretPosition(const PositionWithAffinity& position) {
   m_position = createVisiblePosition(position).toPositionWithAffinity();
   Document* document = nullptr;
   if (Node* node = m_position.anchorNode()) {
     document = &node->document();
     setContext(document);
   }
-  if (!m_position.isNull()) {
-    DCHECK(!m_position.isOrphan());
-    document->updateStyleAndLayoutTree();
-  }
 }
 
 void DragCaret::nodeChildrenWillBeRemoved(ContainerNode& container) {
   if (!hasCaret() || !container.inActiveDocument())
     return;
   Node* const anchorNode = m_position.position().anchorNode();
   if (!anchorNode || anchorNode == container)
     return;
   if (!container.isShadowIncludingInclusiveAncestorOf(anchorNode))
     return;
@@ skipping 25 matching lines @@
 void DragCaret::paintDragCaret(const LocalFrame* frame,
                                GraphicsContext& context,
                                const LayoutPoint& paintOffset) const {
   if (m_position.anchorNode()->document().frame() != frame)
     return;
   m_displayItemClient->paintCaret(context, paintOffset,
                                   DisplayItem::kDragCaret);
 }
 
 }  // namespace blink