Un-refcount SSLClientAuthHandler.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 1757 matching lines @@
 
 void ChromeContentBrowserClient::SelectClientCertificate(
     int render_process_id,
     int render_frame_id,
     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;
   }
 
   prerender::PrerenderContents* prerender_contents =
       prerender::PrerenderContents::FromWebContents(tab);
   if (prerender_contents) {
     prerender_contents->Destroy(
         prerender::FINAL_STATUS_SSL_CLIENT_CERTIFICATE_REQUESTED);
     return;
   }
@@ skipping 823 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome