Use steady_timer type

close #1606

CHANGELOG.md

@@ -10,6 +10,7 @@ Version 256:
 * Add 1-element specialization for `buffers_cat`
 * Fix `buffers_cat` iterator tests
 * Don't pessimize-move
+* Use steady_timer type
 
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example/http/server/fast/http_server_fast.cpp

@@ -111,7 +111,7 @@ private:
     boost::optional<http::request_parser<request_body_t, alloc_t>> parser_;
 
     // The timer putting a time limit on requests.
-    net::basic_waitable_timer<std::chrono::steady_clock> request_deadline_{
+    net::steady_timer request_deadline_{
         acceptor_.get_executor(), (std::chrono::steady_clock::time_point::max)()};
 
     // The string-based response message.

example/http/server/small/http_server_small.cpp

@@ -75,7 +75,7 @@ private:
     http::response<http::dynamic_body> response_;
 
     // The timer for putting a deadline on connection processing.
-    net::basic_waitable_timer<std::chrono::steady_clock> deadline_{
+    net::steady_timer deadline_{
         socket_.get_executor(), std::chrono::seconds(60)};
 
     // Asynchronously receive a complete request message.