Remove navigation_service_unittests, along with the service itself.

services/navigation/public/cpp/BUILD.gn

Index: services/navigation/public/cpp/BUILD.gn
diff --git a/services/navigation/public/cpp/BUILD.gn b/services/navigation/public/cpp/BUILD.gn
deleted file mode 100644
index 4ed76e18e5fb200b09d23eb7426720faca4cd500..0000000000000000000000000000000000000000
--- a/services/navigation/public/cpp/BUILD.gn
+++ /dev/null
@@ -1,19 +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.
-
-static_library("cpp") {
-  sources = [
-    "view.cc",
-    "view.h",
-    "view_delegate.h",
-    "view_observer.h",
-  ]
-
-  deps = [
-    "//base",
-    "//mojo/public/cpp/bindings",
-    "//services/navigation/public/interfaces",
-    "//ui/aura",
-  ]
-}