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