Add some public_deps for //headless:headless_lib.

headless/BUILD.gn

 # Copyright 2015 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/chrome_build.gni")
 import("//headless/headless.gni")
 import("//build/util/process_version.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//printing/features/features.gni")
 import("//testing/test.gni")
@@ skipping 283 matching lines @@
 
   if (enable_basic_printing) {
     sources += [
       "lib/browser/headless_print_manager.cc",
       "lib/browser/headless_print_manager.h",
       "lib/renderer/headless_print_web_view_helper_delegate.cc",
       "lib/renderer/headless_print_web_view_helper_delegate.h",
     ]
   }
 
+  public_deps = [
+    "//base",
+    "//net",
+  ]
+
   deps = [
     ":gen_devtools_client_api",
     ":version_header",
-    "//base",
     "//components/crash/content/browser",
     "//components/security_state/content",
     "//components/security_state/core",
     "//content/public/app:both",
     "//content/public/browser",
     "//content/public/child:child",
     "//content/public/common",
     "//content/public/common:service_names",
-    "//net",
     "//services/service_manager/public/cpp",
     "//third_party/mesa:osmesa",
     "//ui/base",
     "//ui/compositor",
     "//ui/display",
     "//ui/events/devices",
     "//url",
   ]
 
   if (!is_mac) {
@@ skipping 178 matching lines @@
 
 executable("headless_example") {
   sources = [
     "app/headless_example.cc",
   ]
 
   deps = [
     "//headless:headless_shell_lib",
   ]
 }