Remove navigation_service_unittests, along with the service itself.

services/navigation/manifest.json

Index: services/navigation/manifest.json
diff --git a/services/navigation/manifest.json b/services/navigation/manifest.json
deleted file mode 100644
index ed7942907d6dee1d42a8b34b987b4092583450c7..0000000000000000000000000000000000000000
--- a/services/navigation/manifest.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "name": "navigation",
-  "display_name": "Navigation",
-  "interface_provider_specs": {
-    "service_manager:connector": {
-      "provides": {
-        "app": [ "navigation::mojom::ViewFactory" ]
-      },
-      "requires": {
-        "*": [ "app" ],
-        "service_manager": [
-          "service_manager:client_process",
-          "service_manager:user_id",
-          "service_manager:instance_name"
-        ]
-      }
-    }
-  }
-}