Convert DocumentParser code to Use more 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 89355716e7e196b62897d795a11cb3b0fab89f06..a008b80d31fca812afcc4ffe30c8e32c71daa5f4 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2321,7 +2321,7 @@ PassRefPtr<DocumentParser> Document::createParser()
 {
     if (isHTMLDocument()) {
         bool reportErrors = InspectorInstrumentation::collectingHTMLParseErrors(page());
-        return HTMLDocumentParser::create(toHTMLDocument(this), reportErrors);
+        return HTMLDocumentParser::create(toHTMLDocument(*this), reportErrors);
     }
     // FIXME: this should probably pass the frame instead
     return XMLDocumentParser::create(*this, view());