[Sync] Generalize StringOrdinal to handle ordinal_in_parent field

chrome/browser/sync/test/integration/sync_extension_helper.cc

Index: chrome/browser/sync/test/integration/sync_extension_helper.cc
diff --git a/chrome/browser/sync/test/integration/sync_extension_helper.cc b/chrome/browser/sync/test/integration/sync_extension_helper.cc
index b4c0f1db4d4bfc871cd2949620c512d01d91d4d2..0b05557566612c531089d72fb1fe003f92114777 100644
--- a/chrome/browser/sync/test/integration/sync_extension_helper.cc
+++ b/chrome/browser/sync/test/integration/sync_extension_helper.cc
@@ -13,11 +13,11 @@
 #include "chrome/browser/extensions/pending_extension_info.h"
 #include "chrome/browser/extensions/pending_extension_manager.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/sync/test/integration/sync_datatype_helper.h"
+#include "chrome/browser/sync/test/integration/sync_test.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
-#include "chrome/common/string_ordinal.h"
-#include "chrome/browser/sync/test/integration/sync_test.h"
-#include "chrome/browser/sync/test/integration/sync_datatype_helper.h"
+#include "sync/api/string_ordinal.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using extensions::Extension;
@@ -71,7 +71,7 @@ std::string SyncExtensionHelper::InstallExtension(
     return "";
   }
   profile->GetExtensionService()->OnExtensionInstalled(
-      extension, extension->UpdatesFromGallery(), StringOrdinal());
+      extension, extension->UpdatesFromGallery(), syncer::StringOrdinal());
   return extension->id();
 }