Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/aos/logging/dynamic_logging.h b/aos/logging/dynamic_logging.h
index 0dfd181..e3d3a6f 100644
--- a/aos/logging/dynamic_logging.h
+++ b/aos/logging/dynamic_logging.h
@@ -9,8 +9,7 @@
 // and make changes to the log level of the current application based on that
 // message. Currently the only supported command is changing the global vlog
 // level.
-namespace aos {
-namespace logging {
+namespace aos::logging {
 
 class DynamicLogging {
  public:
@@ -23,5 +22,4 @@
   DISALLOW_COPY_AND_ASSIGN(DynamicLogging);
 };
 
-}  // namespace logging
-}  // namespace aos
+}  // namespace aos::logging