Replace remaining shell references with service manager

services/service_manager/manifest.json

 {
   "manifest_version": 1,
-  "name": "service:shell",
+  "name": "service:service_manager",
   "display_name": "Service Manager",
   "capabilities": {
     // NOTE: This manifest is for documentation purposes only. Relevant
     // capability spec is defined inline in the ServiceManager implementation.
     //
     // TODO(rockot): Fix this. We can bake this file into ServiceManager at
     // build time or something. Same with service:catalog.
     "provided": {
       // Clients requesting this class are able to connect to other clients as
       // specific users other than their own.
-      "shell:user_id": [ ],
+      "service_manager:user_id": [ ],
       // Clients requesting this class are allowed to register clients for
       // processes they launch themselves.
-      "shell:client_process": [ ],
+      "service_manager:client_process": [ ],
       // Clients requesting this class are allowed to connect to other clients
       // in specific process instance groups.
-      "shell:instance_name": [ ],
+      "service_manager:instance_name": [ ],
       // Clients requesting this class are run as a unique user id which is
       // visible to clients run as any user.
-      "shell:all_users": [ ],
-      "shell:block_wildcard":  [ ],
+      "service_manager:all_users": [ ],
+      "service_manager:block_wildcard":  [ ],
       // Clients requesting this class block inbound requests to bind interfaces
       // from other sources who specify wildcard rules in their manifest
       // capability interface sets.
-      "shell:explicit_class": [ ],
+      "service_manager:explicit_class": [ ],
 
-      "shell:service_manager": [ "service_manager::mojom::ServiceManager" ]
+      "service_manager:service_manager": [
+        "service_manager::mojom::ServiceManager"
+      ]
     },
     "required": {
-      "service:shell": [ "shell:all_users" ]
+      "service:service_manager": [ "service_manager:all_users" ]
     }
   }
 }