Remove navigation_service_unittests, along with the service itself.

services/navigation/public/interfaces/BUILD.gn

Index: services/navigation/public/interfaces/BUILD.gn
diff --git a/services/navigation/public/interfaces/BUILD.gn b/services/navigation/public/interfaces/BUILD.gn
deleted file mode 100644
index e726a5d39a98abe930de4423be99e45bb83f1313..0000000000000000000000000000000000000000
--- a/services/navigation/public/interfaces/BUILD.gn
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("//mojo/public/tools/bindings/mojom.gni")
-
-mojom("interfaces") {
-  sources = [
-    "view.mojom",
-  ]
-
-  deps = [
-    "//services/ui/public/interfaces",
-    "//ui/gfx/geometry/mojo",
-    "//url/mojo:url_mojom_gurl",
-  ]
-}