Un-refcount SSLClientAuthHandler.

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 5c1a2d37c8ab591dec67de8ce80dd4456aa69c8c..8e786af47aa207d93135b7132f6f4a2d93a9d2c7 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -176,6 +176,14 @@ QuotaPermissionContext* ContentBrowserClient::CreateQuotaPermissionContext() {
   return NULL;
 }
 
+void ContentBrowserClient::SelectClientCertificate(
+    int render_process_id,
+    int render_frame_id,
+    net::SSLCertRequestInfo* cert_request_info,
+    const base::Callback<void(net::X509Certificate*)>& callback) {
+  callback.Run(NULL);
+}
+
 net::URLRequestContext* ContentBrowserClient::OverrideRequestContextForURL(
     const GURL& url, ResourceContext* context) {
   return NULL;