Switch to direct use of OwnerSettingsServiceChromeOS::Set() in tests.

chrome/browser/chromeos/ownership/fake_owner_settings_service.h

Index: chrome/browser/chromeos/ownership/fake_owner_settings_service.h
diff --git a/chrome/browser/chromeos/ownership/fake_owner_settings_service.h b/chrome/browser/chromeos/ownership/fake_owner_settings_service.h
index bed4d066792373a170db9a4dadaa7a41f08ccfaf..8a0bee2f0f2749f1ccf3a0c5dca72fdaf13e638b 100644
--- a/chrome/browser/chromeos/ownership/fake_owner_settings_service.h
+++ b/chrome/browser/chromeos/ownership/fake_owner_settings_service.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 
 class Profile;
 
@@ -19,6 +20,7 @@ namespace chromeos {
 
 class FakeOwnerSettingsService : public OwnerSettingsServiceChromeOS {
  public:
+  explicit FakeOwnerSettingsService(Profile* profile);
   FakeOwnerSettingsService(
       Profile* profile,
       const scoped_refptr<ownership::OwnerKeyUtil>& owner_key_util);
@@ -36,6 +38,7 @@ class FakeOwnerSettingsService : public OwnerSettingsServiceChromeOS {
   void SetManagementSettings(
       const ManagementSettings& settings,
       const OnManagementSettingsSetCallback& callback) override;
+  bool Set(const std::string& setting, const base::Value& value) override;
 
  private:
   bool set_management_settings_result_;