Improve UI for unpacked extensions failing to load

chrome/browser/extensions/api/developer_private/developer_private_api.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/api/developer_private/developer_private_api.h"
 
 #include "apps/app_load_service.h"
 #include "apps/app_restore_service.h"
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
@@ skipping 825 matching lines @@
 
 void DeveloperPrivateEnableFunction::OnRequirementsChecked(
     std::string extension_id,
     std::vector<std::string> requirements_errors) {
   if (requirements_errors.empty()) {
     ExtensionService* service = GetProfile()->GetExtensionService();
     service->EnableExtension(extension_id);
   } else {
     ExtensionErrorReporter::GetInstance()->ReportError(
         base::UTF8ToUTF16(JoinString(requirements_errors, ' ')),
-        true,   // Be noisy.
-        NULL);  // Caller expects no response.
+        true);  // Be noisy.
   }
   Release();
 }
 
 DeveloperPrivateEnableFunction::~DeveloperPrivateEnableFunction() {}
 
 bool DeveloperPrivateInspectFunction::RunImpl() {
   scoped_ptr<developer::Inspect::Params> params(
       developer::Inspect::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get() != NULL);
@@ skipping 496 matching lines @@
   }
 
   error_ui_util::HandleOpenDevTools(dict);
 
   return true;
 }
 
 }  // namespace api
 
 }  // namespace extensions