Have Document::elementSheet() return a reference

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 92f5c6dd47b0fc04183972ac590261bdfc925442..7ca36b19545b74090f4b3a4a9eee53d3c17b9c48 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2903,11 +2903,11 @@ void Document::executeScriptsWaitingForResourcesIfNeeded()
 }
 
 
-CSSStyleSheet* Document::elementSheet()
+CSSStyleSheet& Document::elementSheet()
 {
     if (!m_elemSheet)
         m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
-    return m_elemSheet.get();
+    return *m_elemSheet;
 }
 
 void Document::processHttpEquiv(const AtomicString& equiv, const AtomicString& content, bool inDocumentHeadElement)