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

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index 101fdf78ad71818b057a5d1dc4ce936a8d77d0ec..daf7678c7e020b739b234e12842d8fc138b19995 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -207,7 +207,7 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
 
     RenderStyle* parentStyle = parent()->style();
     RenderInline* parentRenderInline = parent()->isRenderInline() ? toRenderInline(parent()) : 0;
-    bool checkFonts = document()->inNoQuirksMode();
+    bool checkFonts = document().inNoQuirksMode();
     RenderFlowThread* flowThread = flowThreadContainingBlock();
     bool alwaysCreateLineBoxes = (parentRenderInline && parentRenderInline->alwaysCreateLineBoxes())
         || (parentRenderInline && parentStyle->verticalAlign() != BASELINE)
@@ -217,7 +217,7 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
         || parentStyle->lineHeight() != style()->lineHeight()))
         || (flowThread && flowThread->hasRegionsWithStyling());
 
-    if (!alwaysCreateLineBoxes && checkFonts && document()->styleSheetCollections()->usesFirstLineRules()) {
+    if (!alwaysCreateLineBoxes && checkFonts && document().styleSheetCollections()->usesFirstLineRules()) {
         // Have to check the first line style as well.
         parentStyle = parent()->style(true);
         RenderStyle* childStyle = style(true);
@@ -314,7 +314,7 @@ void RenderInline::addChildIgnoringContinuation(RenderObject* newChild, RenderOb
         if (RenderObject* positionedAncestor = inFlowPositionedInlineAncestor(this))
             newStyle->setPosition(positionedAncestor->style()->position());
 
-        RenderBlock* newBox = RenderBlock::createAnonymous(document());
+        RenderBlock* newBox = RenderBlock::createAnonymous(&document());
         newBox->setStyle(newStyle.release());
         RenderBoxModelObject* oldContinuation = continuation();
         setContinuation(newBox);
@@ -349,7 +349,7 @@ void RenderInline::splitInlines(RenderBlock* fromBlock, RenderBlock* toBlock,
     // that renderer is wrapped in a RenderFullScreen, so |this| is not its
     // parent. Since the splitting logic expects |this| to be the parent, set
     // |beforeChild| to be the RenderFullScreen.
-    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document())) {
+    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(&document())) {
         const Element* fullScreenElement = fullscreen->webkitCurrentFullScreenElement();
         if (fullScreenElement && beforeChild && beforeChild->node() == fullScreenElement)
             beforeChild = fullscreen->fullScreenRenderer();
@@ -1288,7 +1288,7 @@ InlineFlowBox* RenderInline::createAndAppendInlineFlowBox()
 
 LayoutUnit RenderInline::lineHeight(bool firstLine, LineDirectionMode /*direction*/, LinePositionMode /*linePositionMode*/) const
 {
-    if (firstLine && document()->styleSheetCollections()->usesFirstLineRules()) {
+    if (firstLine && document().styleSheetCollections()->usesFirstLineRules()) {
         RenderStyle* s = style(firstLine);
         if (s != style())
             return s->computedLineHeight(view());