Make chrome GN build work in component mode.

content/utility/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.
 
 source_set("utility") {
+  # Only the public target should depend on this. All other targets (even
+  # internal content ones) should depend on the public one.
+  visibility = [ "//content/public/utility:utility_sources" ]
+
   sources = [
     "in_process_utility_thread.cc",
     "in_process_utility_thread.h",
     "utility_main.cc",
     "utility_thread_impl.cc",
     "utility_thread_impl.h",
   ]
 
   configs += [ "//content:content_implementation" ]
 
   deps = [
     "//base",
     "//content:export",
-    "//content/public/child",
-    "//content/public/common",
+    "//content/public/child:child_sources",
+    "//content/public/common:common_sources",
     "//courgette:courgette_lib",
     "//mojo/public/interfaces/application",
     "//third_party/WebKit/public:blink_headers",
   ]
 }