UsageCallback      30 webkit/browser/quota/quota_callbacks.h typedef base::Callback<void(int64 usage)> UsageCallback;
UsageCallback      73 webkit/browser/quota/quota_callbacks.h typedef CallbackQueue<UsageCallback, Tuple1<int64> >
UsageCallback     121 webkit/browser/quota/quota_callbacks.h typedef CallbackQueueMap<UsageCallback, std::string, Tuple1<int64> >