1 files changed, 8 insertions, 10 deletions
diff --git a/Source/WebCore/dom/ChildListMutationScope.h b/Source/WebCore/dom/ChildListMutationScope.h
index a179f59b7..945aad5e3 100644
--- a/Source/WebCore/dom/ChildListMutationScope.h
+++ b/Source/WebCore/dom/ChildListMutationScope.h
@@ -28,15 +28,13 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef ChildListMutationScope_h
-#define ChildListMutationScope_h
+#pragma once
 
 #include "Document.h"
 #include "MutationObserver.h"
 #include "Node.h"
-#include <wtf/HashMap.h>
+#include <memory>
 #include <wtf/Noncopyable.h>
-#include <wtf/OwnPtr.h>
 #include <wtf/RefCounted.h>
 
 namespace WebCore {
@@ -46,16 +44,16 @@ class MutationObserverInterestGroup;
 // ChildListMutationAccumulator is not meant to be used directly; ChildListMutationScope is the public interface.
 class ChildListMutationAccumulator : public RefCounted<ChildListMutationAccumulator> {
 public:
-    static PassRefPtr<ChildListMutationAccumulator> getOrCreate(ContainerNode&);
+    static RefPtr<ChildListMutationAccumulator> getOrCreate(ContainerNode&);
     ~ChildListMutationAccumulator();
 
     void childAdded(Node&);
     void willRemoveChild(Node&);
 
-    bool hasObservers() const { return m_observers; }
+    bool hasObservers() const { return !!m_observers; }
 
 private:
-    ChildListMutationAccumulator(ContainerNode&, PassOwnPtr<MutationObserverInterestGroup>);
+    ChildListMutationAccumulator(ContainerNode&, std::unique_ptr<MutationObserverInterestGroup>);
 
     void enqueueMutationRecord();
     bool isEmpty();
@@ -70,7 +68,7 @@ private:
     RefPtr<Node> m_nextSibling;
     Node* m_lastAdded;
 
-    OwnPtr<MutationObserverInterestGroup> m_observers;
+    std::unique_ptr<MutationObserverInterestGroup> m_observers;
 };
 
 class ChildListMutationScope {
@@ -82,6 +80,8 @@ public:
             m_accumulator = ChildListMutationAccumulator::getOrCreate(target);
     }
 
+    bool canObserve() const { return m_accumulator; }
+
     void childAdded(Node& child)
     {
         if (m_accumulator && m_accumulator->hasObservers())
@@ -99,5 +99,3 @@ private:
 };
 
 } // namespace WebCore
-
-#endif // ChildListMutationScope_h