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/util/death_test_log_implementation.h b/aos/util/death_test_log_implementation.h
index 7765b5b..e35f365 100644
--- a/aos/util/death_test_log_implementation.h
+++ b/aos/util/death_test_log_implementation.h
@@ -6,8 +6,7 @@
 #include "aos/logging/context.h"
 #include "aos/logging/implementations.h"
 
-namespace aos {
-namespace util {
+namespace aos::util {
 
 // Prints all FATAL messages to stderr and then abort(3)s before the regular
 // stuff can print out anything else. Ignores all other messages.
@@ -27,7 +26,6 @@
   }
 };
 
-}  // namespace util
-}  // namespace aos
+}  // namespace aos::util
 
 #endif  // AOS_UTIL_DEATH_TEST_LOG_IMPLEMENTATION_H_