Don't set the URL on folders.

chrome/browser/sync/glue/bookmark_change_processor.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/glue/bookmark_change_processor.h"
 
 #include <stack>
 #include <vector>
 
 #include "base/string_util.h"
@@ skipping 32 matching lines @@
   bookmark_model_->RemoveObserver(this);
   bookmark_model_ = NULL;
   model_associator_ = NULL;
 }
 
 void BookmarkChangeProcessor::UpdateSyncNodeProperties(
     const BookmarkNode* src, BookmarkModel* model, sync_api::WriteNode* dst) {
   // Set the properties of the item.
   dst->SetIsFolder(src->is_folder());
   dst->SetTitle(src->GetTitle());
-  dst->SetURL(src->GetURL());
+  if (!src->is_folder())
+    dst->SetURL(src->GetURL());
   SetSyncNodeFavicon(src, model, dst);
 }
 
 // static
 void BookmarkChangeProcessor::EncodeFavicon(const BookmarkNode* src,
                                               BookmarkModel* model,
                                               std::vector<unsigned char>* dst) {
   const SkBitmap& favicon = model->GetFavIcon(src);
 
   dst->clear();
@@ skipping 464 matching lines @@
     const BookmarkNode* bookmark_node,
     BookmarkModel* model,
     sync_api::WriteNode* sync_node) {
   std::vector<unsigned char> favicon_bytes;
   EncodeFavicon(bookmark_node, model, &favicon_bytes);
   if (!favicon_bytes.empty())
     sync_node->SetFaviconBytes(favicon_bytes);
 }
 
 }  // namespace browser_sync