Convert XMLDocumentParser code to Use more reference

Source/core/dom/DocumentParser.cpp

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 
 #include "wtf/Assertions.h"
 
 namespace WebCore {
 
 DocumentParser::DocumentParser(Document* document)
     : m_state(ParsingState)
     , m_documentWasLoadedAsPartOfNavigation(false)
     , m_document(document)
 {
-    ASSERT(document);

[Inactive, 2014/05/08 19:45:42]

Why did you remove this assertion? (you did not make the argument a reference).

[maheshkk, 2014/05/08 20:02:32]

I forgot to undo this change. I originally moved DocumentParser to reference as
well, but will do that in different CL to keep this patch small enough to
review.  

 }
 
 DocumentParser::~DocumentParser()
 {
     // Document is expected to call detach() before releasing its ref.
     // This ASSERT is slightly awkward for parsers with a fragment case
     // as there is no Document to release the ref.
     ASSERT(!m_document);
 }
 
@@ skipping 32 matching lines @@
 void DocumentParser::suspendScheduledTasks()
 {
 }
 
 void DocumentParser::resumeScheduledTasks()
 {
 }
 
 };