Revert of Remove SSLClientAuthHandler's RDH dependency.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 63d52f33b91ee5592eafe9b769df4c30f1d30dc3..22531b8b5df5f7b10adde3e2ca411ea9e4439d4c 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -57,6 +57,7 @@
 namespace net {
 class CookieOptions;
 class CookieStore;
+class HttpNetworkSession;
 class NetLog;
 class SSLCertRequestInfo;
 class SSLInfo;
@@ -393,8 +394,9 @@
   virtual void SelectClientCertificate(
       int render_process_id,
       int render_frame_id,
+      const net::HttpNetworkSession* network_session,
       net::SSLCertRequestInfo* cert_request_info,
-      const base::Callback<void(net::X509Certificate*)>& callback);
+      const base::Callback<void(net::X509Certificate*)>& callback) {}
 
   // Adds a new installable certificate or private key.
   // Typically used to install an X.509 user certificate.