Split HttpNetworkSession::Params into two structs.

ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc

Index: ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
index 16fb60e0885dd44c33c91d91c4c29a6040d5faeb..bfa51b915d813127d8778539270fae5995a4e7d4 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
+++ b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
@@ -484,17 +484,17 @@ ChromeBrowserStateIOData::CreateHttpNetworkSession(
 
   IOSChromeIOThread* const io_thread = profile_params.io_thread;
 
-  net::HttpNetworkSession::Params params(io_thread->NetworkSessionParams());
-  net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(context,
-                                                                 &params);
+  net::HttpNetworkSession::Context session_context;
+  net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(
+      context, &session_context);
   if (!IsOffTheRecord() && io_thread->globals()->network_quality_estimator) {
-    params.socket_performance_watcher_factory =
+    session_context.socket_performance_watcher_factory =
         io_thread->globals()
             ->network_quality_estimator->GetSocketPerformanceWatcherFactory();
   }
 
-  return std::unique_ptr<net::HttpNetworkSession>(
-      new net::HttpNetworkSession(params));
+  return std::unique_ptr<net::HttpNetworkSession>(new net::HttpNetworkSession(
+      io_thread->NetworkSessionParams(), session_context));
 }
 
 std::unique_ptr<net::HttpCache> ChromeBrowserStateIOData::CreateMainHttpFactory(