Fix remaining incompatibilities between scoped_ptr and unique_ptr.

cc/animation/element_animations.h

Index: cc/animation/element_animations.h
diff --git a/cc/animation/element_animations.h b/cc/animation/element_animations.h
index 7a9cd93c83197809e9a71a7149922481d60b9d41..90090cfebfdb36f7acfe80e790436248e6b7e3d3 100644
--- a/cc/animation/element_animations.h
+++ b/cc/animation/element_animations.h
@@ -58,10 +58,10 @@ class CC_EXPORT ElementAnimations : public AnimationDelegate,
   void LayerUnregistered(int layer_id, LayerTreeType tree_type);
 
   bool has_active_value_observer_for_testing() const {
-    return active_value_observer_;
+    return !!active_value_observer_;
   }
   bool has_pending_value_observer_for_testing() const {
-    return pending_value_observer_;
+    return !!pending_value_observer_;
   }
 
   void AddPlayer(AnimationPlayer* player);