Remove navigation_service_unittests, along with the service itself.

content/shell/BUILD.gn

 # Copyright 2014 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("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
@@ skipping 312 matching lines @@
 
   if (is_posix && !is_mac) {
     deps += [
       "//components/crash/content/app",
       "//components/crash/content/browser",
     ]
   }
 
   if (use_aura) {
     deps += [
-      "//services/navigation",
       "//ui/aura",
       "//ui/aura:test_support",
       "//ui/events",
       "//ui/strings",
       "//ui/wm",
     ]
 
     if (toolkit_views) {
       sources += [
         "browser/shell_views.cc",
@@ skipping 462 matching lines @@
     data_deps += [
       "//breakpad:dump_syms",
       "//breakpad:microdump_stackwalk",
       "//breakpad:minidump_dump",
       "//breakpad:minidump_stackwalk",
       "//breakpad:symupload",
       "//tools/android/forwarder2",
     ]
   }
 }