Get rid of wrong assumption in reconcileTextDecorationProperties()

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

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Computer, Inc.
  * Copyright (C) 2010, 2011 Google 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
@@ skipping 1691 matching lines @@
 
 DEFINE_TRACE(EditingStyle) {
   visitor->trace(m_mutableStyle);
 }
 
 static void reconcileTextDecorationProperties(MutableStylePropertySet* style) {
   const CSSValue* textDecorationsInEffect =
       style->getPropertyCSSValue(CSSPropertyWebkitTextDecorationsInEffect);
   const CSSValue* textDecoration =
       style->getPropertyCSSValue(textDecorationPropertyForEditing());
-  // We shouldn't have both text-decoration and
-  // -webkit-text-decorations-in-effect because that wouldn't make sense.
-  DCHECK(!textDecorationsInEffect || !textDecoration);
+  // "LayoutTests/editing/execCommand/insert-list-and-strikethrough.html" makes
+  // both |textDecorationsInEffect| and |textDecoration| non-null.
   if (textDecorationsInEffect) {
     style->setProperty(textDecorationPropertyForEditing(),
                        textDecorationsInEffect->cssText());
     style->removeProperty(CSSPropertyWebkitTextDecorationsInEffect);
     textDecoration = textDecorationsInEffect;
   }
 
   // If text-decoration is set to "none", remove the property because we don't
   // want to add redundant "text-decoration: none".
   if (textDecoration && !textDecoration->isValueList())
@@ skipping 312 matching lines @@
   for (Node* ancestor = node; ancestor; ancestor = ancestor->parentNode()) {
     CSSComputedStyleDeclaration* ancestorStyle =
         CSSComputedStyleDeclaration::create(ancestor);
     if (!hasTransparentBackgroundColor(ancestorStyle))
       return ancestorStyle->getPropertyCSSValue(CSSPropertyBackgroundColor);
   }
   return nullptr;
 }
 
 }  // namespace blink