Componentize proxy code from chrome/browser/net

components/proxy_config/BUILD.gn

Index: components/proxy_config/BUILD.gn
diff --git a/components/proxy_config/BUILD.gn b/components/proxy_config/BUILD.gn
index 439fd305351699aaa8c4265afc7bee1e2adbbd6c..9629d2e9e865c7b7e3e337fb529f85ee17275f53 100644
--- a/components/proxy_config/BUILD.gn
+++ b/components/proxy_config/BUILD.gn
@@ -2,20 +2,30 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# GYP version: components/proxy_config.gypi:proxy_config_component
+# GYP version: components/proxy_config.gypi:proxy_config
 component("proxy_config") {
   sources = [
+    "pref_proxy_config_tracker.cc",
+    "pref_proxy_config_tracker.h",
+    "pref_proxy_config_tracker_impl.cc",
+    "pref_proxy_config_tracker_impl.h",
     "proxy_config_dictionary.cc",
     "proxy_config_dictionary.h",
     "proxy_config_export.h",
+    "proxy_config_pref_names.cc",
+    "proxy_config_pref_names.h",
     "proxy_prefs.cc",
     "proxy_prefs.h",
   ]
 
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
   defines = [ "PROXY_CONFIG_IMPLEMENTATION" ]
 
   deps = [
     "//base",
+    "//base:prefs",
     "//net",
+    "//url",
   ]
 }