Animations: Fix bug where getAnimationPlayers() crashes

Source/core/animation/ElementAnimation.h

Index: Source/core/animation/ElementAnimation.h
diff --git a/Source/core/animation/ElementAnimation.h b/Source/core/animation/ElementAnimation.h
index 63bef0af56830929d920f21163a1e58c67b4952c..a083423cedf912cfaf68eb91ac648edb3dbdf1e4 100644
--- a/Source/core/animation/ElementAnimation.h
+++ b/Source/core/animation/ElementAnimation.h
@@ -91,7 +91,11 @@ public:
 
     static WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> > getAnimationPlayers(Element& element)
     {
-        WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> > animationPlayers = WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> >();
+        WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> > animationPlayers;
+
+        if (!element.hasActiveAnimations())
+            return animationPlayers;
+
         const AnimationPlayerCountedSet& players = element.activeAnimations()->players();
 
         for (AnimationPlayerCountedSet::const_iterator it = players.begin(); it != players.end(); ++it) {