Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/sessions/status_counters.h

Index: sync/internal_api/public/sessions/status_counters.h
diff --git a/sync/internal_api/public/sessions/status_counters.h b/sync/internal_api/public/sessions/status_counters.h
index 83ccd132fedc79863e5b638fe1832a2487b6a3b5..f2358471d22e8f8a2738ded2f7b82b7cedddbeed 100644
--- a/sync/internal_api/public/sessions/status_counters.h
+++ b/sync/internal_api/public/sessions/status_counters.h
@@ -7,9 +7,9 @@
 
 #include <stddef.h>
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "sync/base/sync_export.h"
 
@@ -20,7 +20,7 @@ struct SYNC_EXPORT StatusCounters {
   StatusCounters();
   ~StatusCounters();
 
-  scoped_ptr<base::DictionaryValue> ToValue() const;
+  std::unique_ptr<base::DictionaryValue> ToValue() const;
   std::string ToString() const;
 
   size_t num_entries;