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

Source/core/rendering/InlineFlowBox.cpp

Index: Source/core/rendering/InlineFlowBox.cpp
diff --git a/Source/core/rendering/InlineFlowBox.cpp b/Source/core/rendering/InlineFlowBox.cpp
index 089b2c5cf0d37a8ca452e33e668939a2cc890b8d..f33c69ee0755ba27945102b79d5bcf662260f0d7 100644
--- a/Source/core/rendering/InlineFlowBox.cpp
+++ b/Source/core/rendering/InlineFlowBox.cpp
@@ -1040,7 +1040,7 @@ bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& re
     LayoutUnit height = frameRect.height();
 
     // Constrain our hit testing to the line top and bottom if necessary.
-    bool noQuirksMode = renderer()->document()->inNoQuirksMode();
+    bool noQuirksMode = renderer()->document().inNoQuirksMode();
     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
         RootInlineBox* rootBox = root();
         LayoutUnit& top = isHorizontal() ? minY : minX;
@@ -1208,7 +1208,7 @@ void InlineFlowBox::paintBoxShadow(const PaintInfo& info, RenderStyle* s, Shadow
 
 void InlineFlowBox::constrainToLineTopAndBottomIfNeeded(LayoutRect& rect) const
 {
-    bool noQuirksMode = renderer()->document()->inNoQuirksMode();
+    bool noQuirksMode = renderer()->document().inNoQuirksMode();
     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
         const RootInlineBox* rootBox = root();
         LayoutUnit logicalTop = isHorizontal() ? rect.y() : rect.x();