Update renderer to layoutObject in core/html.

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 372 matching lines @@
             toCanvasRenderingContext2D(m_context.get())->clearRect(0, 0, width(), height());
         }
         return;
     }
 
     setSurfaceSize(newSize);
 
     if (m_context && m_context->is3d() && oldSize != size())
         toWebGLRenderingContextBase(m_context.get())->reshape(width(), height());
 
-    if (LayoutObject* renderer = this->layoutObject()) {
-        if (renderer->isCanvas()) {
+    if (LayoutObject* layoutObject = this->layoutObject()) {
+        if (layoutObject->isCanvas()) {
             if (oldSize != size()) {
-                toLayoutHTMLCanvas(renderer)->canvasSizeChanged();
+                toLayoutHTMLCanvas(layoutObject)->canvasSizeChanged();
                 if (layoutBox() && layoutBox()->hasAcceleratedCompositing())
                     layoutBox()->contentChanged(CanvasChanged);
             }
             if (hadImageBuffer)
-                renderer->setShouldDoFullPaintInvalidation();
+                layoutObject->setShouldDoFullPaintInvalidation();
         }
     }
 
     for (CanvasObserver* canvasObserver : m_observers)
         canvasObserver->canvasResized(this);
 }
 
 bool HTMLCanvasElement::paintsIntoCanvasBuffer() const
 {
     ASSERT(m_context);
@@ skipping 465 matching lines @@
 {
     return FloatSize(width(), height());
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // blink