Remove SSLClientAuthHandler's RDH dependency.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 2b9c6b9636a062d88e51554bbd59cd5f6185196e..d40df82a00a55427bdc0c16ca17e144796138dc7 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1739,14 +1739,14 @@ void ChromeContentBrowserClient::AllowCertificateError(
 void ChromeContentBrowserClient::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) {
   content::RenderFrameHost* rfh = content::RenderFrameHost::FromID(
       render_process_id, render_frame_id);
   WebContents* tab = WebContents::FromRenderFrameHost(rfh);
   if (!tab) {
-    NOTREACHED();
+    // TODO(davidben): This makes the request hang, but returning no certificate
+    // also breaks. It should abort the request. See https://crbug.com/417092
     return;
   }
 
@@ -1792,8 +1792,7 @@ void ChromeContentBrowserClient::SelectClientCertificate(
     }
   }
 
-  chrome::ShowSSLClientCertificateSelector(tab, network_session,
-                                           cert_request_info, callback);
+  chrome::ShowSSLClientCertificateSelector(tab, cert_request_info, callback);
 }
 
 void ChromeContentBrowserClient::AddCertificate(