Rename shell namespace to service_manager

services/service_manager/service_overrides.cc

Index: services/service_manager/service_overrides.cc
diff --git a/services/service_manager/service_overrides.cc b/services/service_manager/service_overrides.cc
index 177aaa6742fa9290158c38f76c018914095fb8fe..90452c08ee89e4ce15742d1f4c9dccebb38b0c9b 100644
--- a/services/service_manager/service_overrides.cc
+++ b/services/service_manager/service_overrides.cc
@@ -9,7 +9,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 
-namespace shell {
+namespace service_manager {
 
 namespace {
 
@@ -75,4 +75,4 @@ bool ServiceOverrides::GetExecutablePathOverride(
   return true;
 }
 
-}  // namespace shell
+}  // namespace service_manager