Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h

Index: third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h
diff --git a/third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h b/third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h
index 61932a2b605c6f8a1c7b9a8da762d94780436a18..35f8a426173084353abcf8db145fdb26028ea985 100644
--- a/third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h
+++ b/third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h
@@ -40,7 +40,6 @@
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringHash.h"
-#include <memory>
 
 namespace blink {
 
@@ -147,10 +146,10 @@ private:
     HashSet<AtomicString>& ensureAttributeSet();
 
     // FIXME: optimize this if it becomes a memory issue.
-    std::unique_ptr<HashSet<AtomicString>> m_classes;
-    std::unique_ptr<HashSet<AtomicString>> m_ids;
-    std::unique_ptr<HashSet<AtomicString>> m_tagNames;
-    std::unique_ptr<HashSet<AtomicString>> m_attributes;
+    OwnPtr<HashSet<AtomicString>> m_classes;
+    OwnPtr<HashSet<AtomicString>> m_ids;
+    OwnPtr<HashSet<AtomicString>> m_tagNames;
+    OwnPtr<HashSet<AtomicString>> m_attributes;
 
     unsigned m_type : 1;