Pass InteractionStats by value

chrome/browser/password_manager/password_store_mac.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 94 matching lines @@
       base::Time delete_end) override;
   std::vector<std::unique_ptr<autofill::PasswordForm>> FillMatchingLogins(
       const FormDigest& form) override;
   bool FillAutofillableLogins(
       std::vector<std::unique_ptr<autofill::PasswordForm>>* forms) override;
   bool FillBlacklistLogins(
       std::vector<std::unique_ptr<autofill::PasswordForm>>* forms) override;
   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
   // the operation succeeded (either we added successfully, or we didn't need
   // to).
   bool AddToKeychainIfNecessary(const autofill::PasswordForm& form);
 
   // Returns true if our database contains a form that exactly matches the given
   // keychain form.
   bool DatabaseHasFormMatchingKeychainForm(
@@ skipping 15 matching lines @@
   std::unique_ptr<crypto::AppleKeychain> keychain_;
 
   // The login metadata SQL database. The caller is resonsible for initializing
   // it.
   password_manager::LoginDatabase* login_metadata_db_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordStoreMac);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_