Fold AppModalDialog into its only subclass, JavaScriptAppModalDialog.

chrome/browser/extensions/alert_apitest.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 <stddef.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/ui_test_utils.h"
-#include "components/app_modal/app_modal_dialog.h"
 #include "components/app_modal/app_modal_dialog_queue.h"
 #include "components/app_modal/javascript_app_modal_dialog.h"
 #include "components/app_modal/native_app_modal_dialog.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/common/extension.h"
 
 namespace {
 
 void GetNextDialog(app_modal::NativeAppModalDialog** native_dialog) {
   DCHECK(native_dialog);
   *native_dialog = nullptr;
-  app_modal::AppModalDialog* dialog = ui_test_utils::WaitForAppModalDialog();
-  ASSERT_TRUE(dialog->IsJavaScriptModalDialog());
-  app_modal::JavaScriptAppModalDialog* js_dialog =
-      static_cast<app_modal::JavaScriptAppModalDialog*>(dialog);
-  *native_dialog = js_dialog->native_dialog();
+  app_modal::JavaScriptAppModalDialog* dialog =
+      ui_test_utils::WaitForAppModalDialog();
+  *native_dialog = dialog->native_dialog();
   ASSERT_TRUE(*native_dialog);
 }
 
 void CloseDialog() {
   app_modal::NativeAppModalDialog* dialog = nullptr;
   ASSERT_NO_FATAL_FAILURE(GetNextDialog(&dialog));
   dialog->CloseAppModalDialog();
 }
 
 void AcceptDialog() {
@@ skipping 116 matching lines @@
 
   // All dialogs must be closed now.
   app_modal::AppModalDialogQueue* queue =
       app_modal::AppModalDialogQueue::GetInstance();
   ASSERT_TRUE(queue);
   EXPECT_FALSE(queue->HasActiveDialog());
   EXPECT_EQ(0, queue->end() - queue->begin());
   while (call_count < num_accepted_dialogs + num_cancelled_dialogs)
     ASSERT_NO_FATAL_FAILURE(content::RunAllPendingInMessageLoop());
 }