[Refactor] Move creating a browser if necessary to ExtensionInstallDialogView

chrome/browser/apps/ephemeral_app_launcher.cc

 // Copyright 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/apps/ephemeral_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_install_checker.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
@@ skipping 169 matching lines @@
 
 scoped_ptr<extensions::ExtensionInstallChecker>
 EphemeralAppLauncher::CreateInstallChecker() {
   return make_scoped_ptr(new ExtensionInstallChecker(profile()));
 }
 
 scoped_ptr<ExtensionInstallPrompt> EphemeralAppLauncher::CreateInstallUI() {
   if (web_contents())
     return make_scoped_ptr(new ExtensionInstallPrompt(web_contents()));
 
-  return make_scoped_ptr(
-      new ExtensionInstallPrompt(profile(), parent_window_, NULL));
+  return make_scoped_ptr(new ExtensionInstallPrompt(profile(), parent_window_));
 }
 
 scoped_ptr<WebstoreInstaller::Approval> EphemeralAppLauncher::CreateApproval()
     const {
   scoped_ptr<WebstoreInstaller::Approval> approval =
       WebstoreStandaloneInstaller::CreateApproval();
   approval->is_ephemeral = true;
   return approval.Pass();
 }
 
@@ skipping 254 matching lines @@
 
   // CompleteInstall will call Release.
   WebstoreStandaloneInstaller::CompleteInstall(webstore_install::SUCCESS,
                                                std::string());
 }
 
 void EphemeralAppLauncher::ExtensionEnableFlowAborted(bool user_initiated) {
   // CompleteInstall will call Release.
   CompleteInstall(webstore_install::USER_CANCELLED, kUserCancelledError);
 }