Make Element::ensureActiveAnimations() return a reference

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 6be8386d7e8af3438c153481e9deae2e3a438536..509eabf7573f7b248f5d8dfc209544a83f2ec587 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -369,12 +369,12 @@ ActiveAnimations* Element::activeAnimations() const
     return 0;
 }
 
-ActiveAnimations* Element::ensureActiveAnimations()
+ActiveAnimations& Element::ensureActiveAnimations()
 {
     ElementRareData& rareData = ensureElementRareData();
     if (!rareData.activeAnimations())
         rareData.setActiveAnimations(adoptPtr(new ActiveAnimations()));
-    return rareData.activeAnimations();
+    return *rareData.activeAnimations();
 }
 
 bool Element::hasActiveAnimations() const