message: Remove code which can NOT be executed
diff: @@ -2111,13 +2111,6 @@ class LRUCache {
  void Clear() {
  if (lru_list_.empty()) return;
  - // delete the cached objects
  - for (auto& key : lru_list_) {
  - auto it = cache_.find(key);
  - DCHECK(it != cache_.end());
  - delete it->second.op;
  - }
  -
  // clean up the cache
  cache_.clear();
  lru_list_.clear();
  