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 da2ab1c139a709a3cc71509beb0699a577dbb0ad..13c50a903ea46dec6d545f64527e1742ada007e0 100644
--- a/chrome/browser/sync/test/integration/bookmarks_helper.cc
+++ b/chrome/browser/sync/test/integration/bookmarks_helper.cc
@@ -233,7 +233,8 @@ 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