Nest all namespaces

The compiler supports this now.  We can type less going forward.
No functional changes.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I29d6fa4f9aacc0e381f1a7637294db0392466995
diff --git a/aos/network/web_proxy.cc b/aos/network/web_proxy.cc
index d48d700..15ebb66 100644
--- a/aos/network/web_proxy.cc
+++ b/aos/network/web_proxy.cc
@@ -34,8 +34,7 @@
               "If we have not received any ack's in this amount of time, we "
               "start to continue sending messages.");
 
-namespace aos {
-namespace web_proxy {
+namespace aos::web_proxy {
 WebsocketHandler::WebsocketHandler(::seasocks::Server *server,
                                    aos::EventLoop *event_loop,
                                    StoreHistory store_history,
@@ -699,5 +698,4 @@
   }
 }
 
-}  // namespace web_proxy
-}  // namespace aos
+}  // namespace aos::web_proxy