Pass InteractionStats by value

chrome/browser/password_manager/password_store_mac.h

Index: chrome/browser/password_manager/password_store_mac.h
diff --git a/chrome/browser/password_manager/password_store_mac.h b/chrome/browser/password_manager/password_store_mac.h
index 9c6b3d4e7ce66d03c48df3e4824d647d11b9afb4..b7a581502c5c2a7ab67f93c681df02bd65782c34 100644
--- a/chrome/browser/password_manager/password_store_mac.h
+++ b/chrome/browser/password_manager/password_store_mac.h
@@ -112,8 +112,8 @@ class PasswordStoreMac : public password_manager::PasswordStore {
   void AddSiteStatsImpl(
       const password_manager::InteractionsStats& stats) override;
   void RemoveSiteStatsImpl(const GURL& origin_domain) override;
-  std::vector<std::unique_ptr<password_manager::InteractionsStats>>
-  GetSiteStatsImpl(const GURL& origin_domain) override;
+  std::vector<password_manager::InteractionsStats> GetSiteStatsImpl(
+      const GURL& origin_domain) override;
 
   // Adds the given form to the Keychain if it's something we want to store
   // there (i.e., not a blacklist entry or a federated login). Returns true if