message: config: minor cleanup: remove DeltaSubscriptionState::resource_names_
diff: @@ -105,7 +105,7 @@ void DeltaSubscriptionState::handleGoodResponse(
  // initial_resource_versions messages, but will remind us to explicitly tell the server "I'm
  // cancelling my subscription" when we lose interest.
  for (const auto& resource_name : message.removed_resources()) {
  - if (resource_names_.find(resource_name) != resource_names_.end()) {
  + if (resource_versions_.find(resource_name) != resource_versions_.end()) {
  setResourceWaitingForServer(resource_name);
  }
  }
  @@ -175,17 +175,14 @@ void* DeltaSubscriptionState::getNextRequestWithAck(const UpdateAck& ack) {
  void DeltaSubscriptionState::setResourceVersion(const std::string& resource_name,
  const std::string& resource_version) {
  resource_versions_[resource_name] = ResourceVersion(resource_version);
  - resource_names_.insert(resource_name);
  }
  void DeltaSubscriptionState::setResourceWaitingForServer(const std::string& resource_name) {
  resource_versions_[resource_name] = ResourceVersion();
  - resource_names_.insert(resource_name);
  }
  void DeltaSubscriptionState::setLostInterestInResource(const std::string& resource_name) {
  resource_versions_.erase(resource_name);
  - resource_names_.erase(resource_name);
  }
  } // namespace Config
  