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_utils.cc b/aos/network/web_proxy_utils.cc
index d6148d4..f4468ab 100644
--- a/aos/network/web_proxy_utils.cc
+++ b/aos/network/web_proxy_utils.cc
@@ -1,7 +1,6 @@
 #include "aos/network/web_proxy_utils.h"
 
-namespace aos {
-namespace web_proxy {
+namespace aos::web_proxy {
 
 namespace {
 // Recommended max size is 64KiB for compatibility reasons. 256KiB theoretically
@@ -98,5 +97,4 @@
   return buffers;
 }
 
-}  // namespace web_proxy
-}  // namespace aos
+}  // namespace aos::web_proxy