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/vision/image/jpeg_routines.h b/aos/vision/image/jpeg_routines.h
index 59ad296..4bac976 100644
--- a/aos/vision/image/jpeg_routines.h
+++ b/aos/vision/image/jpeg_routines.h
@@ -8,8 +8,7 @@
 
 #include "aos/vision/image/image_types.h"
 
-namespace aos {
-namespace vision {
+namespace aos::vision {
 
 // Returns true if successful false if an error was encountered.
 // Will decompress data into out. Out must be of the right size
@@ -32,7 +31,6 @@
   return ProcessJpeg(data, value->data());
 }
 
-}  // namespace vision
-}  // namespace aos
+}  // namespace aos::vision
 
 #endif  // _AOS_VISION_IMAGE_JPEGROUTINES_H_