Fix loading success.html at the end of chrome://chrome-signin flow

extensions/browser/url_request_util.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 "extensions/browser/url_request_util.h"
 
 #include <string>
 
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/browser_side_navigation_policy.h"
@@ skipping 138 matching lines @@
                                           const Extension* extension,
                                           const Extension* owner_extension,
                                           const std::string& partition_id,
                                           const std::string& resource_path,
                                           ui::PageTransition page_transition,
                                           bool* allowed) {
   if (is_guest) {
     // An extension's resources should only be accessible to WebViews owned by
     // that extension.
     if (owner_extension != extension) {
-      *allowed = false;
-      return true;
+      bool is_signin_extension =
+          extension && extension->id() == "mfffpogegjflfpflabcdkioaeobkgjik";
+      if (!is_signin_extension) {
+        LOG(ERROR) << "NOT Allowed ";
+        *allowed = false;
+        return true;
+      } else {
+        LOG(ERROR)
+            << "Sign-in extension is allowed to load cross renderrer resouces";
+      }
     }
 
     *allowed = WebviewInfo::IsResourceWebviewAccessible(extension, partition_id,
                                                         resource_path);
+    LOG(ERROR) << "Allowed? " << extension->id() << " to load " << resource_path
+               << ":" << *allowed;
     return true;
   }
 
   return false;
 }
 
 }  // namespace url_request_util
 }  // namespace extensions