Have ElementRareData::ensure*() methods return references

Source/core/dom/ElementRareData.cpp

Index: Source/core/dom/ElementRareData.cpp
diff --git a/Source/core/dom/ElementRareData.cpp b/Source/core/dom/ElementRareData.cpp
index 85889c3aae58cf8308c2f8d6667077078ed1cf54..8512151a0b4587d7c4344fa26d61046a865343bf 100644
--- a/Source/core/dom/ElementRareData.cpp
+++ b/Source/core/dom/ElementRareData.cpp
@@ -43,11 +43,11 @@ struct SameSizeAsElementRareData : NodeRareData {
     void* pointers[11];
 };
 
-CSSStyleDeclaration* ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)
+CSSStyleDeclaration& ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)
 {
     if (!m_cssomWrapper)
         m_cssomWrapper = adoptPtr(new InlineCSSStyleDeclaration(ownerElement));
-    return m_cssomWrapper.get();
+    return *m_cssomWrapper;
 }