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

Source/core/svg/SVGFontFaceElement.cpp

Index: Source/core/svg/SVGFontFaceElement.cpp
diff --git a/Source/core/svg/SVGFontFaceElement.cpp b/Source/core/svg/SVGFontFaceElement.cpp
index 9c77958d73a21c58c53ece74e52952cca11e00b0..c3e4c587b9a1b40c8941afd087f37dcc9082b17d 100644
--- a/Source/core/svg/SVGFontFaceElement.cpp
+++ b/Source/core/svg/SVGFontFaceElement.cpp
@@ -316,7 +316,7 @@ void SVGFontFaceElement::rebuildFontFace()
         }
     }
 
-    document()->styleResolverChanged(RecalcStyleDeferred);
+    document().styleResolverChanged(RecalcStyleDeferred);
 }
 
 Node::InsertionNotificationRequest SVGFontFaceElement::insertedInto(ContainerNode* rootParent)
@@ -326,7 +326,7 @@ Node::InsertionNotificationRequest SVGFontFaceElement::insertedInto(ContainerNod
         ASSERT(!m_fontElement);
         return InsertionDone;
     }
-    document()->accessSVGExtensions()->registerSVGFontFaceElement(this);
+    document().accessSVGExtensions()->registerSVGFontFaceElement(this);
 
     rebuildFontFace();
     return InsertionDone;
@@ -338,10 +338,10 @@ void SVGFontFaceElement::removedFrom(ContainerNode* rootParent)
 
     if (rootParent->inDocument()) {
         m_fontElement = 0;
-        document()->accessSVGExtensions()->unregisterSVGFontFaceElement(this);
+        document().accessSVGExtensions()->unregisterSVGFontFaceElement(this);
         m_fontFaceRule->mutableProperties()->clear();
 
-        document()->styleResolverChanged(RecalcStyleDeferred);
+        document().styleResolverChanged(RecalcStyleDeferred);
     } else
         ASSERT(!m_fontElement);
 }