Have Node::document() return a reference instead of a pointer

Source/core/inspector/InspectorStyleSheet.cpp

Index: Source/core/inspector/InspectorStyleSheet.cpp
diff --git a/Source/core/inspector/InspectorStyleSheet.cpp b/Source/core/inspector/InspectorStyleSheet.cpp
index ff1fe398abdd3d5616297ff1577f0d0dd5aa0a87..20cc7cde371175c8594d1bb43b91ac095b9e8c85 100644
--- a/Source/core/inspector/InspectorStyleSheet.cpp
+++ b/Source/core/inspector/InspectorStyleSheet.cpp
@@ -1758,7 +1758,7 @@ PassOwnPtr<Vector<unsigned> > InspectorStyleSheetForInlineStyle::lineEndings() c
 
 Document* InspectorStyleSheetForInlineStyle::ownerDocument() const
 {
-    return m_element->document();
+    return &m_element->document();
 }
 
 bool InspectorStyleSheetForInlineStyle::ensureParsedDataReady()
@@ -1815,8 +1815,8 @@ PassRefPtr<CSSRuleSourceData> InspectorStyleSheetForInlineStyle::getStyleAttribu
 
     RefPtr<MutableStylePropertySet> tempDeclaration = MutableStylePropertySet::create();
     RuleSourceDataList ruleSourceDataResult;
-    StyleSheetHandler handler(m_styleText, m_element->document(), m_element->document()->elementSheet()->contents(), &ruleSourceDataResult);
-    createCSSParser(m_element->document())->parseDeclaration(tempDeclaration.get(), m_styleText, &handler, m_element->document()->elementSheet()->contents());
+    StyleSheetHandler handler(m_styleText, &m_element->document(), m_element->document().elementSheet()->contents(), &ruleSourceDataResult);
+    createCSSParser(&m_element->document())->parseDeclaration(tempDeclaration.get(), m_styleText, &handler, m_element->document().elementSheet()->contents());
     return ruleSourceDataResult.first().release();
 }