Replace ASSERT with DCHECK in core/layout/<sub dirs>

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceGradient.cpp

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 24 matching lines @@
     bool markForInvalidation) {
   m_gradientMap.clear();
   m_shouldCollectGradientAttributes = true;
   markAllClientsForInvalidation(markForInvalidation ? PaintInvalidation
                                                     : ParentOnlyInvalidation);
 }
 
 void LayoutSVGResourceGradient::removeClientFromCache(
     LayoutObject* client,
     bool markForInvalidation) {
-  ASSERT(client);
+  DCHECK(client);
   m_gradientMap.erase(client);
   markClientForInvalidation(
       client, markForInvalidation ? PaintInvalidation : ParentOnlyInvalidation);
 }
 
 SVGPaintServer LayoutSVGResourceGradient::preparePaintServer(
     const LayoutObject& object) {
   clearInvalidationMask();
 
   // Validate gradient DOM state before building the actual
@@ skipping 65 matching lines @@
       return SpreadMethodReflect;
     case SVGSpreadMethodRepeat:
       return SpreadMethodRepeat;
   }
 
   NOTREACHED();
   return SpreadMethodPad;
 }
 
 }  // namespace blink