Move onc and proxy pref names to components.

chrome/browser/chromeos/net/proxy_config_handler.h

Index: chrome/browser/chromeos/net/proxy_config_handler.h
diff --git a/chrome/browser/chromeos/net/proxy_config_handler.h b/chrome/browser/chromeos/net/proxy_config_handler.h
index 9d573f908d9a55d2265ae53e0bd04b74cf7d58dc..ea358475399d0d67ba205cfd785537ead876e647 100644
--- a/chrome/browser/chromeos/net/proxy_config_handler.h
+++ b/chrome/browser/chromeos/net/proxy_config_handler.h
@@ -36,10 +36,6 @@ std::unique_ptr<ProxyConfigDictionary> GetProxyConfigForNetwork(
 void SetProxyConfigForNetwork(const ProxyConfigDictionary& proxy_config,
                               const NetworkState& network);
 
-void RegisterPrefs(PrefRegistrySimple* registry);
-
-void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
 }  // namespace proxy_config
 
 }  // namespace chromeos