Use common code to set HttpNetworkSession::Param pointers.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 1fb1b4cffde3963ac911ef927bc1cbd3f74b60d3..d441b7a3a833d02e3172fd6a174ac0ffbc234f09 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -423,6 +423,14 @@ class IOThread : public content::BrowserThreadDelegate {
       const base::CommandLine& command_line,
       const VariationParameters& quic_trial_params);
 
+  static net::URLRequestContext* ConstructSystemRequestContext(
+      IOThread::Globals* globals,
+      net::NetLog* net_log);
+
+  static net::URLRequestContext* ConstructProxyScriptFetcherContext(
+      IOThread::Globals* globals,
+      net::NetLog* net_log);
+
   // The NetLog is owned by the browser process, to allow logging from other
   // threads during shutdown, but is used most frequently on the IOThread.
   ChromeNetLog* net_log_;