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/trapezoid_profile.h b/aos/util/trapezoid_profile.h
index 944c423..6669777 100644
--- a/aos/util/trapezoid_profile.h
+++ b/aos/util/trapezoid_profile.h
@@ -6,8 +6,7 @@
 #include "aos/macros.h"
 #include "aos/time/time.h"
 
-namespace aos {
-namespace util {
+namespace aos::util {
 
 // Calculates a trapezoidal motion profile (like for a control loop's goals).
 // Supports having the end speed and position changed in the middle.
@@ -63,7 +62,6 @@
   DISALLOW_COPY_AND_ASSIGN(TrapezoidProfile);
 };
 
-}  // namespace util
-}  // namespace aos
+}  // namespace aos::util
 
 #endif  // AOS_UTIL_TRAPEZOID_PROFILE_H_