Add/resurrect support for bundles of WebStore items.

chrome/browser/extensions/extension_install_prompt.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/extensions/extension_install_prompt.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 919 matching lines @@
         extensions::PermissionMessageProvider::Get();
     prompt_->SetPermissions(message_provider->GetLegacyWarningMessages(
                                 permissions_to_display.get(), type),
                             REGULAR_PERMISSIONS);
     prompt_->SetPermissionsDetails(
         message_provider->GetLegacyWarningMessagesDetails(
             permissions_to_display.get(), type),
         REGULAR_PERMISSIONS);
 
     scoped_refptr<const extensions::PermissionSet> withheld =
-        extension_->permissions_data()->withheld_permissions();
-    if (!withheld->IsEmpty()) {
+        extension_ ? extension_->permissions_data()->withheld_permissions()
+                   : nullptr;
+    if (withheld && !withheld->IsEmpty()) {
       prompt_->SetPermissions(
           message_provider->GetLegacyWarningMessages(withheld.get(), type),
           PermissionsType::WITHHELD_PERMISSIONS);
       prompt_->SetPermissionsDetails(
           message_provider->GetLegacyWarningMessagesDetails(withheld.get(),
                                                             type),
           PermissionsType::WITHHELD_PERMISSIONS);
     }
   }
 
@@ skipping 30 matching lines @@
   if (show_params_->WasParentDestroyed()) {
     delegate_->InstallUIAbort(false);
     return;
   }
 
   if (show_dialog_callback_.is_null())
     GetDefaultShowDialogCallback().Run(show_params_.get(), delegate_, prompt_);
   else
     show_dialog_callback_.Run(show_params_.get(), delegate_, prompt_);
 }