Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/extensions/unpacked_installer.cc

Index: chrome/browser/extensions/unpacked_installer.cc
diff --git a/chrome/browser/extensions/unpacked_installer.cc b/chrome/browser/extensions/unpacked_installer.cc
index f812a2f5f368e2391f6404ffb8128699c844337f..463f7d4ba9550f9b44c192ed0d5be41d496072ff 100644
--- a/chrome/browser/extensions/unpacked_installer.cc
+++ b/chrome/browser/extensions/unpacked_installer.cc
@@ -258,9 +258,13 @@ int UnpackedInstaller::GetFlags() {
   if (prefs->HasAllowFileAccessSetting(id))
     allow_file_access = prefs->AllowFileAccess(id);
 
+  bool installed_by_custodian = prefs->WasInstalledByCustodian(id);
+
   int result = Extension::FOLLOW_SYMLINKS_ANYWHERE;
   if (allow_file_access)
     result |= Extension::ALLOW_FILE_ACCESS;
+  if (installed_by_custodian)
+    result |= Extension::WAS_INSTALLED_BY_CUSTODIAN;
   if (require_modern_manifest_version_)
     result |= Extension::REQUIRE_MODERN_MANIFEST_VERSION;