Have Element::ensureMutableInlineStyle() return a reference

Source/core/inspector/InspectorStyleSheet.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 1503 matching lines @@
 void InspectorStyleSheet::revalidateStyle(CSSStyleDeclaration* pageStyle)
 {
     if (m_isRevalidating)
         return;
 
     m_isRevalidating = true;
     ensureFlatRules();
     for (unsigned i = 0, size = m_flatRules.size(); i < size; ++i) {
         CSSStyleRule* parsedRule = InspectorCSSAgent::asCSSStyleRule(m_flatRules.at(i).get());
         if (parsedRule && parsedRule->style() == pageStyle) {
-            if (parsedRule->styleRule()->properties()->asText() != pageStyle->cssText())
+            if (parsedRule->styleRule()->properties().asText() != pageStyle->cssText())
                 setStyleText(pageStyle, pageStyle->cssText());
             break;
         }
     }
     m_isRevalidating = false;
 }
 
 bool InspectorStyleSheet::originalStyleSheetText(String* result) const
 {
     bool success = inlineStyleSheetText(result);
@@ skipping 158 matching lines @@
 
     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());
     return ruleSourceDataResult.first().release();
 }
 
 } // namespace WebCore