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

Source/core/rendering/RenderBlockLineLayout.cpp

Index: Source/core/rendering/RenderBlockLineLayout.cpp
diff --git a/Source/core/rendering/RenderBlockLineLayout.cpp b/Source/core/rendering/RenderBlockLineLayout.cpp
index 5ecc8f9633d92837e3a8b41bbca34511682fe81a..bf668a209f58f0b83712d659bc67131a6795e077 100644
--- a/Source/core/rendering/RenderBlockLineLayout.cpp
+++ b/Source/core/rendering/RenderBlockLineLayout.cpp
@@ -56,7 +56,7 @@ const unsigned cMaxLineDepth = 200;
 
 static LayoutUnit logicalHeightForLine(const RenderBlock* block, bool isFirstLine, LayoutUnit replacedHeight = 0)
 {
-    if (!block->document()->inNoQuirksMode() && replacedHeight)
+    if (!block->document().inNoQuirksMode() && replacedHeight)
         return replacedHeight;
 
     if (!(block->style(isFirstLine)->lineBoxContain() & LineBoxContainBlock))
@@ -529,7 +529,7 @@ static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRo
         // We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
         // (Note the use of strict mode.  In "almost strict" mode, we don't treat the box for <br> as text.)
         if (obj->isBR())
-            textBox->setIsText(isOnlyRun || obj->document()->inNoQuirksMode());
+            textBox->setIsText(isOnlyRun || obj->document().inNoQuirksMode());
         return textBox;
     }
 
@@ -2476,7 +2476,7 @@ static inline bool shouldCollapseWhiteSpace(const RenderStyle* style, const Line
 static bool requiresLineBoxForContent(RenderInline* flow, const LineInfo& lineInfo)
 {
     RenderObject* parent = flow->parent();
-    if (flow->document()->inNoQuirksMode()
+    if (flow->document().inNoQuirksMode()
         && (flow->style(lineInfo.isFirstLine())->lineHeight() != parent->style(lineInfo.isFirstLine())->lineHeight()
         || flow->style()->verticalAlign() != parent->style()->verticalAlign()
         || !parent->style()->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(flow->style()->font().fontMetrics())))
@@ -2799,7 +2799,7 @@ InlineIterator RenderBlock::LineBreaker::nextSegmentBreak(InlineBidiResolver& re
     // very specific circumstances (in order to match common WinIE renderings).
     // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.)
     RenderStyle* blockStyle = m_block->style();
-    bool allowImagesToBreak = !m_block->document()->inQuirksMode() || !m_block->isTableCell() || !blockStyle->logicalWidth().isIntrinsicOrAuto();
+    bool allowImagesToBreak = !m_block->document().inQuirksMode() || !m_block->isTableCell() || !blockStyle->logicalWidth().isIntrinsicOrAuto();
 
     EWhiteSpace currWS = blockStyle->whiteSpace();
     EWhiteSpace lastWS = currWS;