Make ChromePasswordManagerClient::BindCredentialManager handle missing client gracefully

chrome/browser/password_manager/chrome_password_manager_client.cc

 // Copyright 2014 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/password_manager/chrome_password_manager_client.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 618 matching lines @@
 // static
 void ChromePasswordManagerClient::BindCredentialManager(
     content::RenderFrameHost* render_frame_host,
     password_manager::mojom::CredentialManagerRequest request) {
   content::WebContents* web_contents =
       content::WebContents::FromRenderFrameHost(render_frame_host);
   DCHECK(web_contents);
 
   ChromePasswordManagerClient* instance =
       ChromePasswordManagerClient::FromWebContents(web_contents);
-  DCHECK(instance);
+
+  // Try to bind to the driver, but if driver is not available for this render
+  // frame host, the request will be just dropped. This will cause the message
+  // pipe to be closed, which will raise a connection error on the peer side.
+  if (!instance)
+    return;
+
   instance->credential_manager_impl_.BindRequest(std::move(request));
 }