Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/themes/theme_syncable_service.cc

Index: chrome/browser/themes/theme_syncable_service.cc
diff --git a/chrome/browser/themes/theme_syncable_service.cc b/chrome/browser/themes/theme_syncable_service.cc
index 79b0e27ddb718b6b6498636c11b2cd58e23b8650..076d2d2e5fc08f1003bc39619819b06db6bd5c7a 100644
--- a/chrome/browser/themes/theme_syncable_service.cc
+++ b/chrome/browser/themes/theme_syncable_service.cc
@@ -235,14 +235,12 @@ void ThemeSyncableService::SetCurrentThemeFromThemeSpecifics(
       // so by adding it as a pending extension and then triggering an
       // auto-update cycle.
       const bool kRemoteInstall = false;
-      const bool kInstalledByCustodian = false;
       if (!extensions_service->pending_extension_manager()->AddFromSync(
               id,
               update_url,
               base::Version(),
               &IsTheme,
-              kRemoteInstall,
-              kInstalledByCustodian)) {
+              kRemoteInstall)) {
         LOG(WARNING) << "Could not add pending extension for " << id;
         return;
       }