Have Node::document() return a reference instead of a pointer

Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 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 624 matching lines @@
     // taking into account the moved origin and the fact that we're in drawing space (+y = down).
     secondPoint.set(halfWidth + endX, halfHeight - endY);
     // Reflect around the center for the start point.
     firstPoint.set(halfWidth - endX, halfHeight + endY);
 }
 
 PassRefPtr<Gradient> CSSLinearGradientValue::createGradient(RenderObject* renderer, const IntSize& size)
 {
     ASSERT(!size.isEmpty());
 
-    RenderStyle* rootStyle = renderer->document()->documentElement()->renderStyle();
+    RenderStyle* rootStyle = renderer->document().documentElement()->renderStyle();
 
     FloatPoint firstPoint;
     FloatPoint secondPoint;
     if (m_angle) {
         float angle = m_angle->getFloatValue(CSSPrimitiveValue::CSS_DEG);
         endPointsFromAngle(angle, size, firstPoint, secondPoint, m_gradientType);
     } else {
         switch (m_gradientType) {
         case CSSDeprecatedLinearGradient:
             firstPoint = computeEndPoint(m_firstX.get(), m_firstY.get(), renderer->style(), rootStyle, size);
@@ skipping 321 matching lines @@
     // a/b = aspectRatio, b = a/aspectRatio
     // a = sqrt(x^2 + y^2/(1/r^2))
     return sqrtf(p.width() * p.width() + (p.height() * p.height()) / (1 / (aspectRatio * aspectRatio)));
 }
 
 // FIXME: share code with the linear version
 PassRefPtr<Gradient> CSSRadialGradientValue::createGradient(RenderObject* renderer, const IntSize& size)
 {
     ASSERT(!size.isEmpty());
 
-    RenderStyle* rootStyle = renderer->document()->documentElement()->renderStyle();
+    RenderStyle* rootStyle = renderer->document().documentElement()->renderStyle();
 
     FloatPoint firstPoint = computeEndPoint(m_firstX.get(), m_firstY.get(), renderer->style(), rootStyle, size);
     if (!m_firstX)
         firstPoint.setX(size.width() / 2);
     if (!m_firstY)
         firstPoint.setY(size.height() / 2);
 
     FloatPoint secondPoint = computeEndPoint(m_secondX.get(), m_secondY.get(), renderer->style(), rootStyle, size);
     if (!m_secondX)
         secondPoint.setX(size.width() / 2);
@@ skipping 166 matching lines @@
         equalHorizontalAndVerticalSize = compareCSSValuePtr(m_endHorizontalSize, other.m_endHorizontalSize) && compareCSSValuePtr(m_endVerticalSize, other.m_endVerticalSize);
     else {
         equalShape = !other.m_shape;
         equalSizingBehavior = !other.m_sizingBehavior;
         equalHorizontalAndVerticalSize = !other.m_endHorizontalSize && !other.m_endVerticalSize;
     }
     return equalShape && equalSizingBehavior && equalHorizontalAndVerticalSize && m_stops == other.m_stops;
 }
 
 } // namespace WebCore