Convert DocumentParser code to Use more reference

Source/core/inspector/DOMPatchSupport.cpp

Index: Source/core/inspector/DOMPatchSupport.cpp
diff --git a/Source/core/inspector/DOMPatchSupport.cpp b/Source/core/inspector/DOMPatchSupport.cpp
index f03c4ac5fc0c73d022032a43402f7119afce391c..df2bdd15d7f17884904fba5ba4d07c02f3904f8f 100644
--- a/Source/core/inspector/DOMPatchSupport.cpp
+++ b/Source/core/inspector/DOMPatchSupport.cpp
@@ -95,7 +95,7 @@ void DOMPatchSupport::patchDocument(const String& markup)
     newDocument->setContextFeatures(m_document.contextFeatures());
     RefPtr<DocumentParser> parser;
     if (m_document.isHTMLDocument())
-        parser = HTMLDocumentParser::create(toHTMLDocument(newDocument.get()), false);
+        parser = HTMLDocumentParser::create(toHTMLDocument(*newDocument), false);
     else
         parser = XMLDocumentParser::create(*newDocument, 0);
     parser->insert(markup); // Use insert() so that the parser will not yield.