Remove mojo network service.

testing/buildbot/chromium.linux.json

 {
   "Android GN": {
     "gtest_tests": [
       {
         "test": "android_webview_unittests"
       },
       {
         "test": "base_unittests"
       },
       {
@@ skipping 845 matching lines @@
         },
         "test": "nacl_loader_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "net_unittests"
       },
       {
-        "test": "network_service_unittests"
-      },
-      {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ppapi_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "printing_unittests"
@@ skipping 866 matching lines @@
       }
     ],
     "scripts": [
       {
         "name": "nacl_integration",
         "script": "nacl_integration.py"
       }
     ]
   }
 }