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

Source/core/rendering/RenderNamedFlowThread.cpp

Index: Source/core/rendering/RenderNamedFlowThread.cpp
diff --git a/Source/core/rendering/RenderNamedFlowThread.cpp b/Source/core/rendering/RenderNamedFlowThread.cpp
index bc72e9a873810db2140a9c0df4d299a173f6beb9..9601e69cfa9ab4734918820bbd587af25e4e91d2 100644
--- a/Source/core/rendering/RenderNamedFlowThread.cpp
+++ b/Source/core/rendering/RenderNamedFlowThread.cpp
@@ -82,7 +82,7 @@ void RenderNamedFlowThread::clearContentNodes()
 
         ASSERT(contentNode && contentNode->isElementNode());
         ASSERT(contentNode->inNamedFlow());
-        ASSERT(contentNode->document() == document());
+        ASSERT(&contentNode->document() == &document());
 
         contentNode->clearInNamedFlow();
     }
@@ -440,7 +440,7 @@ void RenderNamedFlowThread::pushDependencies(RenderNamedFlowThreadList& list)
 void RenderNamedFlowThread::registerNamedFlowContentNode(Node* contentNode)
 {
     ASSERT(contentNode && contentNode->isElementNode());
-    ASSERT(contentNode->document() == document());
+    ASSERT(&contentNode->document() == &document());
 
     contentNode->setInNamedFlow();
 
@@ -463,7 +463,7 @@ void RenderNamedFlowThread::unregisterNamedFlowContentNode(Node* contentNode)
     ASSERT(contentNode && contentNode->isElementNode());
     ASSERT(m_contentNodes.contains(contentNode));
     ASSERT(contentNode->inNamedFlow());
-    ASSERT(contentNode->document() == document());
+    ASSERT(&contentNode->document() == &document());
 
     contentNode->clearInNamedFlow();
     m_contentNodes.remove(contentNode);
@@ -493,7 +493,7 @@ bool RenderNamedFlowThread::isChildAllowed(RenderObject* child, RenderStyle* sty
 void RenderNamedFlowThread::dispatchRegionLayoutUpdateEvent()
 {
     RenderFlowThread::dispatchRegionLayoutUpdateEvent();
-    InspectorInstrumentation::didUpdateRegionLayout(document(), m_namedFlow.get());
+    InspectorInstrumentation::didUpdateRegionLayout(&document(), m_namedFlow.get());
 
     if (!m_regionLayoutUpdateEventTimer.isActive() && m_namedFlow->hasEventListeners())
         m_regionLayoutUpdateEventTimer.startOneShot(0);
@@ -502,7 +502,7 @@ void RenderNamedFlowThread::dispatchRegionLayoutUpdateEvent()
 void RenderNamedFlowThread::dispatchRegionOversetChangeEvent()
 {
     RenderFlowThread::dispatchRegionOversetChangeEvent();
-    InspectorInstrumentation::didChangeRegionOverset(document(), m_namedFlow.get());
+    InspectorInstrumentation::didChangeRegionOverset(&document(), m_namedFlow.get());
 
     if (!m_regionOversetChangeEventTimer.isActive() && m_namedFlow->hasEventListeners())
         m_regionOversetChangeEventTimer.startOneShot(0);
@@ -595,7 +595,7 @@ void RenderNamedFlowThread::getRanges(Vector<RefPtr<Range> >& rangeObjects, cons
         if (!contentNode->renderer())
             continue;
 
-        RefPtr<Range> range = Range::create(contentNode->document());
+        RefPtr<Range> range = Range::create(&contentNode->document());
         bool foundStartPosition = false;
         bool startsAboveRegion = true;
         bool endsBelowRegion = true;
@@ -636,7 +636,7 @@ void RenderNamedFlowThread::getRanges(Vector<RefPtr<Range> >& rangeObjects, cons
                         if (range->intersectsNode(node, IGNORE_EXCEPTION))
                             range->setEndBefore(node, IGNORE_EXCEPTION);
                         rangeObjects.append(range->cloneRange(IGNORE_EXCEPTION));
-                        range = Range::create(contentNode->document());
+                        range = Range::create(&contentNode->document());
                         startsAboveRegion = true;
                     } else
                         skipOverOutsideNodes = true;