Introduce SystemNetworkContextManager.

content/public/browser/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/ui.gni")
 
 # See //content/BUILD.gn for how this works.
 group("browser") {
   if (is_component_build) {
     public_deps = [
@@ skipping 151 matching lines @@
     "navigation_details.cc",
     "navigation_details.h",
     "navigation_entry.h",
     "navigation_handle.cc",
     "navigation_handle.h",
     "navigation_throttle.cc",
     "navigation_throttle.h",
     "navigation_type.h",
     "navigation_ui_data.h",
     "network_quality_observer_factory.h",
+    "network_service_instance.cc",
+    "network_service_instance.h",
     "notification_database_data.cc",
     "notification_database_data.h",
     "notification_details.h",
     "notification_event_dispatcher.h",
     "notification_observer.h",
     "notification_registrar.cc",
     "notification_registrar.h",
     "notification_service.h",
     "notification_source.h",
     "notification_types.h",
@@ skipping 134 matching lines @@
   ]
   deps = [
     "//cc",
     "//content/browser",  # Must not be public_deps!
     "//device/geolocation",
     "//gpu",
     "//media",
     "//net",
     "//ppapi/c",
     "//services/device/public/interfaces",
+    "//third_party/webrtc/modules/desktop_capture",
     "//ui/accessibility",
     "//ui/base",
     "//ui/events",
     "//ui/gl",
     "//ui/surface",
-    "//third_party/webrtc/modules/desktop_capture",
   ]
 
   allow_circular_includes_from = [
     # This target is a pair with content/browser. They always go together and
     # include headers from each other.
     "//content/browser",
   ]
 
   if (is_android) {
     deps += [ "//ui/android" ]
@@ skipping 12 matching lines @@
     ]
   }
 
   if (is_chromeos) {
     sources += [
       "arc_tracing_agent.cc",
       "arc_tracing_agent.h",
     ]
   }
 }