[Refactor] Move creating a browser if necessary to ExtensionInstallDialogView

chrome/browser/extensions/unpacked_installer.cc

 // Copyright (c) 2013 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/unpacked_installer.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_util.h"
@@ skipping 54 matching lines @@
 };
 
 SimpleExtensionLoadPrompt::SimpleExtensionLoadPrompt(
     const Extension* extension,
     Profile* profile,
     const base::Closure& callback)
     : extension_(extension), callback_(callback) {
   scoped_ptr<extensions::ExtensionInstallUI> ui(
       extensions::CreateExtensionInstallUI(profile));
   install_ui_.reset(new ExtensionInstallPrompt(
-      profile, ui->GetDefaultInstallDialogParent(), NULL));
+      profile, ui->GetDefaultInstallDialogParent()));
 }
 
 SimpleExtensionLoadPrompt::~SimpleExtensionLoadPrompt() {
 }
 
 void SimpleExtensionLoadPrompt::ShowPrompt() {
   switch (ExtensionInstallPrompt::g_auto_confirm_for_tests) {
     case ExtensionInstallPrompt::NONE:
       install_ui_->ConfirmInstall(
           this,
@@ skipping 273 matching lines @@
 
   PermissionsUpdater perms_updater(service_weak_->profile());
   perms_updater.InitializePermissions(extension());
   perms_updater.GrantActivePermissions(extension());
 
   service_weak_->OnExtensionInstalled(
       extension(), syncer::StringOrdinal(), kInstallFlagInstallImmediately);
 }
 
 }  // namespace extensions