Convert DocumentParser code to Use more reference

Source/core/html/parser/TextDocumentParser.h

Index: Source/core/html/parser/TextDocumentParser.h
diff --git a/Source/core/html/parser/TextDocumentParser.h b/Source/core/html/parser/TextDocumentParser.h
index 9134274bccb3390ff660289a1f491b6140173b0a..ab8b8b051e179be00da847ede80d1720cb9e5017 100644
--- a/Source/core/html/parser/TextDocumentParser.h
+++ b/Source/core/html/parser/TextDocumentParser.h
@@ -32,14 +32,14 @@ namespace WebCore {
 
 class TextDocumentParser FINAL : public HTMLDocumentParser {
 public:
-    static PassRefPtr<TextDocumentParser> create(HTMLDocument* document)
+    static PassRefPtr<TextDocumentParser> create(HTMLDocument& document)
     {
         return adoptRef(new TextDocumentParser(document));
     }
     virtual ~TextDocumentParser();
 
 private:
-    explicit TextDocumentParser(HTMLDocument*);
+    explicit TextDocumentParser(HTMLDocument&);
 
     virtual void appendBytes(const char*, size_t) OVERRIDE;
     void insertFakePreElement();