Use a hosted app's opener URL and not its origin to locate it.

content/browser/mock_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 "content/browser/mock_content_browser_client.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 217 matching lines @@
     bool worker) {
 }
 
 void MockContentBrowserClient::CancelDesktopNotification(
     int render_process_id,
     int render_view_id,
     int notification_id) {
 }
 
 bool MockContentBrowserClient::CanCreateWindow(
+    const GURL& opener_url,
     const GURL& source_origin,
     WindowContainerType container_type,
     ResourceContext* context,
     int render_process_id) {
   return true;
 }
 
 std::string MockContentBrowserClient::GetWorkerProcessTitle(
     const GURL& url, ResourceContext* context) {
   return std::string();
@@ skipping 77 matching lines @@
 #endif
 
 #if defined(USE_NSS)
 crypto::CryptoModuleBlockingPasswordDelegate*
     MockContentBrowserClient::GetCryptoPasswordDelegate(const GURL& url) {
   return NULL;
 }
 #endif
 
 }  // namespace content