Have ElementRareData::ensure*() methods return references

Source/core/dom/ElementRareData.h

Index: Source/core/dom/ElementRareData.h
diff --git a/Source/core/dom/ElementRareData.h b/Source/core/dom/ElementRareData.h
index c3189379b3e96341787d15a303ca5f1c3a82cb71..40942a5743ee012179e069e56b5d8865e4556403 100644
--- a/Source/core/dom/ElementRareData.h
+++ b/Source/core/dom/ElementRareData.h
@@ -91,7 +91,7 @@ public:
     unsigned childIndex() const { return m_childIndex; }
     void setChildIndex(unsigned index) { m_childIndex = index; }
 
-    CSSStyleDeclaration* ensureInlineCSSStyleDeclaration(Element* ownerElement);
+    CSSStyleDeclaration& ensureInlineCSSStyleDeclaration(Element* ownerElement);
 
     void clearShadow() { m_shadow = nullptr; }
     ElementShadow* shadow() const { return m_shadow.get(); }
@@ -137,11 +137,11 @@ public:
     void setHasPendingResources(bool has) { m_hasPendingResources = has; }
 
     bool hasInputMethodContext() const { return m_inputMethodContext; }
-    InputMethodContext* ensureInputMethodContext(HTMLElement* element)
+    InputMethodContext& ensureInputMethodContext(HTMLElement* element)
     {
         if (!m_inputMethodContext)
             m_inputMethodContext = InputMethodContext::create(element);
-        return m_inputMethodContext.get();
+        return *m_inputMethodContext;
     }
 
     bool hasPseudoElements() const;