Reduce the memory usage of bookmarks storage

components/sync_bookmarks/bookmark_change_processor.cc

Index: components/sync_bookmarks/bookmark_change_processor.cc
diff --git a/components/sync_bookmarks/bookmark_change_processor.cc b/components/sync_bookmarks/bookmark_change_processor.cc
index 96d50b12215ba35fa52175d51c3ad4c06b168a5c..5394b5ad526354c021ab1c4bdf205f39339b2206 100644
--- a/components/sync_bookmarks/bookmark_change_processor.cc
+++ b/components/sync_bookmarks/bookmark_change_processor.cc
@@ -968,7 +968,8 @@ void BookmarkChangeProcessor::SetSyncNodeFavicon(
         sync_node->GetBookmarkSpecifics());
     updated_specifics.set_favicon(favicon_bytes->front(),
                                   favicon_bytes->size());
-    updated_specifics.set_icon_url(bookmark_node->icon_url().spec());
+    updated_specifics.set_icon_url(
+        bookmark_node->icon_url() ? bookmark_node->icon_url()->spec() : "");

[sky, 2017/05/12 20:00:13]

"" -> std::string()

[ssid, 2017/05/25 00:27:27]

Done.

     sync_node->SetBookmarkSpecifics(updated_specifics);
   }
 }