Have Document::timing() / Document::contextFeatures() return a reference

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index c895725783d710aa74c21a8c291e882ea0cd6c36..0f2147940f74b4c61813ad4f781a9edf2f14df02 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -929,7 +929,7 @@ public:
     PassRefPtr<Touch> createTouch(DOMWindow*, EventTarget*, int identifier, int pageX, int pageY, int screenX, int screenY, int radiusX, int radiusY, float rotationAngle, float force) const;
     PassRefPtr<TouchList> createTouchList(Vector<RefPtr<Touch> >&) const;
 
-    const DocumentTiming* timing() const { return &m_documentTiming; }
+    const DocumentTiming& timing() const { return m_documentTiming; }
 
     int requestAnimationFrame(PassOwnPtr<RequestAnimationFrameCallback>);
     void cancelAnimationFrame(int id);
@@ -986,8 +986,8 @@ public:
     void incrementActiveParserCount() { ++m_activeParserCount; }
     void decrementActiveParserCount();
 
-    void setContextFeatures(PassRefPtr<ContextFeatures>);
-    ContextFeatures* contextFeatures() const { return m_contextFeatures.get(); }
+    void setContextFeatures(ContextFeatures&);
+    ContextFeatures& contextFeatures() const { return *m_contextFeatures; }
 
     ElementDataCache* elementDataCache() { return m_elementDataCache.get(); }