Cleanup async client APIs.

webcc/queue.h

@@ -12,7 +12,7 @@ namespace webcc {
 
 template <typename T>
 class Queue {
- public:
+public:
   Queue() = default;
 
   Queue(const Queue&) = delete;
@@ -49,7 +49,7 @@ class Queue {
     not_empty_cv_.notify_one();
   }
 
- private:
+private:
   std::list<T> message_list_;
   std::mutex mutex_;
   std::condition_variable not_empty_cv_;