Fold AppModalDialog into its only subclass, JavaScriptAppModalDialog.

chrome/browser/lifetime/browser_close_manager_browsertest.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/lifetime/browser_close_manager.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 46 matching lines @@
 #include "net/test/url_request/url_request_mock_http_job.h"
 #include "net/test/url_request/url_request_slow_download_job.h"
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/chromeos_switches.h"
 #endif
 
 namespace {
 
 app_modal::NativeAppModalDialog* GetNextDialog() {
-  app_modal::AppModalDialog* dialog = ui_test_utils::WaitForAppModalDialog();
-  EXPECT_TRUE(dialog->IsJavaScriptModalDialog());
-  app_modal::JavaScriptAppModalDialog* js_dialog =
-      static_cast<app_modal::JavaScriptAppModalDialog*>(dialog);
-  CHECK(js_dialog->native_dialog());
-  return js_dialog->native_dialog();
+  app_modal::JavaScriptAppModalDialog* dialog =
+      ui_test_utils::WaitForAppModalDialog();
+  CHECK(dialog->native_dialog());
+  return dialog->native_dialog();
 }
 
 // Note: call |PrepareForDialog| on the relevant WebContents or Browser before
 // trying to close it, to avoid flakiness. https://crbug.com/519646
 void AcceptClose() {
   GetNextDialog()->AcceptAppModalDialog();
 }
 
 // Note: call |PrepareForDialog| on the relevant WebContents or Browser before
 // trying to close it, to avoid flakiness. https://crbug.com/519646
@@ skipping 1253 matching lines @@
 
   chrome::CloseAllBrowsers();
   EXPECT_FALSE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
   EXPECT_TRUE(IsBackgroundModeSuspended());
 }
 
 INSTANTIATE_TEST_CASE_P(BrowserCloseManagerWithBackgroundModeBrowserTest,
                         BrowserCloseManagerWithBackgroundModeBrowserTest,
                         testing::Bool());