Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/sessions/update_counters.h

Index: sync/internal_api/public/sessions/update_counters.h
diff --git a/sync/internal_api/public/sessions/update_counters.h b/sync/internal_api/public/sessions/update_counters.h
index 7ce8b5e4a2c6d69d63613440bc41a645f1e877b4..ae755448bf4e4256bc4e0622f67004f4b36953c2 100644
--- a/sync/internal_api/public/sessions/update_counters.h
+++ b/sync/internal_api/public/sessions/update_counters.h
@@ -5,9 +5,9 @@
 #ifndef SYNC_INTERNAL_API_PUBLIC_SESSIONS_UPDATE_COUNTERS_H_
 #define SYNC_INTERNAL_API_PUBLIC_SESSIONS_UPDATE_COUNTERS_H_
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "sync/base/sync_export.h"
 
@@ -19,7 +19,7 @@ struct SYNC_EXPORT UpdateCounters {
   UpdateCounters();
   ~UpdateCounters();
 
-  scoped_ptr<base::DictionaryValue> ToValue() const;
+  std::unique_ptr<base::DictionaryValue> ToValue() const;
   std::string ToString() const;
 
   int num_updates_received;