bookmarks: Wait for bookmark model to load by using WaitForBookmarkModelToLoad() function.

chrome/browser/ui/bookmarks/bookmark_browsertest.cc

Index: chrome/browser/ui/bookmarks/bookmark_browsertest.cc
diff --git a/chrome/browser/ui/bookmarks/bookmark_browsertest.cc b/chrome/browser/ui/bookmarks/bookmark_browsertest.cc
index 933e996d6fef07a90164d292dc5a4aa6fd4cfc55..5e8a7b29da7936de3268c3638fc039c6941df61c 100644
--- a/chrome/browser/ui/bookmarks/bookmark_browsertest.cc
+++ b/chrome/browser/ui/bookmarks/bookmark_browsertest.cc
@@ -57,12 +57,7 @@ class BookmarkBrowsertest : public InProcessBrowserTest {
   BookmarkModel* WaitForBookmarkModel(Profile* profile) {
     BookmarkModel* bookmark_model =
         BookmarkModelFactory::GetForProfile(profile);
-    if (!bookmark_model->IsLoaded()) {
-      content::WindowedNotificationObserver observer(
-          chrome::NOTIFICATION_BOOKMARK_MODEL_LOADED,
-          content::NotificationService::AllSources());
-      observer.Wait();
-    }
+    ui_test_utils::WaitForBookmarkModelToLoad(bookmark_model);
     return bookmark_model;
   }
 };