Make stylesheet owner node a reference instead of pointer.

third_party/WebKit/Source/core/css/CSSTestHelper.cpp

 /*
  * Copyright (c) 2014, 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 29 matching lines @@
 namespace blink {
 
 CSSTestHelper::~CSSTestHelper()
 {
 }
 
 CSSTestHelper::CSSTestHelper()
 {
     m_document = Document::create();
     TextPosition position;
-    m_styleSheet = CSSStyleSheet::createInline(m_document.get(), KURL(), position, "UTF-8");
+    m_styleSheet = CSSStyleSheet::createInline(*m_document, KURL(), position, "UTF-8");
 }
 
 CSSRuleList* CSSTestHelper::cssRules()
 {
     return m_styleSheet->cssRules();
 }
 
 RuleSet& CSSTestHelper::ruleSet()
 {
     RuleSet& ruleSet = m_styleSheet->contents()->ensureRuleSet(MediaQueryEvaluator(), RuleHasNoSpecialState);
     ruleSet.compactRulesIfNeeded();
     return ruleSet;
 }
 
 void CSSTestHelper::addCSSRules(const char* cssText)
 {
     TextPosition position;
     unsigned sheetLength = m_styleSheet->length();
     m_styleSheet->contents()->parseStringAtPosition(cssText, position);
     ASSERT_TRUE(m_styleSheet->length() > sheetLength);
 }
 
 } // namespace blink