Avoid copying the data string when posting ImportantFileWriter write tasks

components/bookmarks/browser/bookmark_storage.cc

Index: components/bookmarks/browser/bookmark_storage.cc
diff --git a/components/bookmarks/browser/bookmark_storage.cc b/components/bookmarks/browser/bookmark_storage.cc
index daafdbea09378a185baf8bc13b0277eba9afd290..2612f9c324d680b7f00ea6c00bea46d670e8fb2c 100644
--- a/components/bookmarks/browser/bookmark_storage.cc
+++ b/components/bookmarks/browser/bookmark_storage.cc
@@ -205,10 +205,10 @@ bool BookmarkStorage::SaveNow() {
     return false;
   }
 
-  std::string data;
-  if (!SerializeData(&data))
+  scoped_ptr<std::string> data(new std::string);
+  if (!SerializeData(data.get()))
     return false;
-  writer_.WriteNow(data);
+  writer_.WriteNow(data.Pass());
   return true;
 }