Don't depend on /net for error codes in sky viewer.

sky/viewer/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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojo_native_application("viewer") {
   output_name = "sky_viewer"
 
@@ skipping 34 matching lines @@
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
     "//mojo/public/interfaces/application",
     "//mojo/services/content_handler/public/interfaces",
     "//mojo/services/gpu/public/interfaces",
     "//mojo/services/input_events/public/interfaces",
     "//mojo/services/navigation/public/interfaces",
     "//mojo/services/network/public/interfaces",
     "//mojo/services/surfaces/public/interfaces",
     "//mojo/services/view_manager/public/cpp",
-    "//net",
     "//skia",
     "//sky/compositor",
     "//sky/engine",
     "//sky/engine/tonic",
     "//sky/services/inspector:bindings",
     "//sky/services/testing:bindings",
     "//third_party/icu",
     "//ui/events",
     "//url",
   ]
 }
 
 mojom("bindings") {
   sources = [
     "services/inspector.mojom",
   ]
 }