Fix mismatched nullptr check for caret paint invalidation.

third_party/WebKit/Source/core/editing/FrameCaret.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 169 matching lines @@
   // invalidate the caret. For example, when running as a layout test the
   // caret blink interval could be zero and thus |m_caretBlinkTimer| will
   // never be started. We provide |forceInvalidation| for use by paint
   // invalidation internals where we need to invalidate the caret regardless
   // of timer state.
   if (!forceInvalidation && !m_caretBlinkTimer.isActive() &&
       newNode == m_previousCaretNode && newRect == m_previousCaretRect &&
       m_caretVisibility == m_previousCaretVisibility)
     return;
 
-  if (m_previousCaretNode && shouldRepaintCaret(*m_previousCaretAnchorNode)) {
+  if (m_previousCaretAnchorNode &&
+      shouldRepaintCaret(*m_previousCaretAnchorNode)) {
     invalidateLocalCaretRect(m_previousCaretAnchorNode.get(),
                              m_previousCaretRect);
   }
-  if (newNode && shouldRepaintCaret(*newAnchorNode))
+  if (newAnchorNode && shouldRepaintCaret(*newAnchorNode))
     invalidateLocalCaretRect(newAnchorNode, newRect);
   m_previousCaretNode = newNode;
   m_previousCaretAnchorNode = newAnchorNode;
   m_previousCaretRect = newRect;
   m_previousCaretVisibility = m_caretVisibility;
 }
 
 IntRect FrameCaret::absoluteCaretBounds() {
   DCHECK_NE(m_frame->document()->lifecycle().state(),
             DocumentLifecycle::InPaintInvalidation);
@@ skipping 84 matching lines @@
 
 void FrameCaret::caretBlinkTimerFired(TimerBase*) {
   DCHECK_EQ(m_caretVisibility, CaretVisibility::Visible);
   if (isCaretBlinkingSuspended() && m_shouldPaintCaret)
     return;
   m_shouldPaintCaret = !m_shouldPaintCaret;
   setCaretRectNeedsUpdate();
 }
 
 }  // namespace blink