Reduce the memory usage of bookmarks storage

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

Index: chrome/browser/sync/test/integration/bookmarks_helper.cc
diff --git a/chrome/browser/sync/test/integration/bookmarks_helper.cc b/chrome/browser/sync/test/integration/bookmarks_helper.cc
index 9208fb3eb12add2f837a3be2313d8d3608d8dea0..18dc172e0a68fc3e916f67b6e0c1124f1a6dc45c 100644
--- a/chrome/browser/sync/test/integration/bookmarks_helper.cc
+++ b/chrome/browser/sync/test/integration/bookmarks_helper.cc
@@ -235,7 +235,8 @@ FaviconData GetFaviconData(BookmarkModel* model,
     model->GetFavicon(node);
     observer.WaitForGetFavicon();
   }
-  return FaviconData(model->GetFavicon(node), node->icon_url());
+  return FaviconData(model->GetFavicon(node),
+                     node->icon_url() ? *node->icon_url() : GURL());
 }
 
 // Sets the favicon for |profile| and |node|. |profile| may be