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

Source/core/rendering/AutoTableLayout.cpp

 /*
  * Copyright (C) 2002 Lars Knoll (knoll@kde.org)
  *           (C) 2002 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2008, 2010 Apple Inc. 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.
  *
@@ skipping 108 matching lines @@
                 } else if (!effCol || section->primaryCellAt(i, effCol - 1) != cell) {
                     // This spanning cell originates in this column. Insert the cell into spanning cells list.
                     insertSpanCell(cell);
                 }
             }
         }
     }
 
     // Nav/IE weirdness
     if (columnLayout.logicalWidth.isFixed()) {
-        if (m_table->document()->inQuirksMode() && columnLayout.maxLogicalWidth > columnLayout.logicalWidth.value() && fixedContributor != maxContributor) {
+        if (m_table->document().inQuirksMode() && columnLayout.maxLogicalWidth > columnLayout.logicalWidth.value() && fixedContributor != maxContributor) {
             columnLayout.logicalWidth = Length();
             fixedContributor = 0;
         }
     }
 
     columnLayout.maxLogicalWidth = max(columnLayout.maxLogicalWidth, columnLayout.minLogicalWidth);
 }
 
 void AutoTableLayout::fullRecalc()
 {
@@ skipping 569 matching lines @@
 
     int pos = 0;
     for (size_t i = 0; i < nEffCols; ++i) {
         m_table->setColumnPosition(i, pos);
         pos += m_layoutStruct[i].computedLogicalWidth + m_table->hBorderSpacing();
     }
     m_table->setColumnPosition(m_table->columnPositions().size() - 1, pos);
 }
 
 }