Write last_modified date to Content Settings in the PrefProvider

components/content_settings/core/browser/content_settings_policy_provider.cc

Index: components/content_settings/core/browser/content_settings_policy_provider.cc
diff --git a/components/content_settings/core/browser/content_settings_policy_provider.cc b/components/content_settings/core/browser/content_settings_policy_provider.cc
index c2967aa41a68010245b9793394eef5705b3f06b6..3923d0f6ab32282782b9f410a6f8178b67fa77f9 100644
--- a/components/content_settings/core/browser/content_settings_policy_provider.cc
+++ b/components/content_settings/core/browser/content_settings_policy_provider.cc
@@ -235,9 +235,10 @@ void PolicyProvider::GetContentSettingsFromPreferences(
       VLOG_IF(2, !pattern_pair.second.IsValid())
           << "Replacing invalid secondary pattern '"
           << pattern_pair.second.ToString() << "' with wildcard";
+      // Don't set a timestamp for policy settings.
       value_map->SetValue(
           pattern_pair.first, secondary_pattern, content_type,
-          ResourceIdentifier(),
+          ResourceIdentifier(), base::Time(),
           new base::Value(kPrefsForManagedContentSettingsMap[i].setting));
     }
   }
@@ -319,11 +320,10 @@ void PolicyProvider::GetAutoSelectCertificateSettingsFromPreferences(
 
     // Don't pass removed values from |value|, because base::Values read with
     // JSONReader use a shared string buffer. Instead, DeepCopy here.
-    value_map->SetValue(pattern,
-                        ContentSettingsPattern::Wildcard(),
+    // Don't set a timestamp for policy settings.
+    value_map->SetValue(pattern, ContentSettingsPattern::Wildcard(),
                         CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE,
-                        std::string(),
-                        cert_filter->DeepCopy());
+                        std::string(), base::Time(), cert_filter->DeepCopy());
   }
 }
 
@@ -356,9 +356,10 @@ void PolicyProvider::UpdateManagedDefaultSetting(
                            ContentSettingsPattern::Wildcard(),
                            entry.content_type, std::string());
   } else {
+    // Don't set a timestamp for policy settings.
     value_map_.SetValue(ContentSettingsPattern::Wildcard(),
                         ContentSettingsPattern::Wildcard(), entry.content_type,
-                        std::string(), new base::Value(setting));
+                        std::string(), base::Time(), new base::Value(setting));
   }
 }