Fold AppModalDialog into its only subclass, JavaScriptAppModalDialog.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index 810c6f97f8dcc2e62ea11ebce19ca3d791751e4f..6120c4b00130201b335da469ef4053d93f9f8130 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -103,8 +103,8 @@
 #include "chrome/grit/generated_resources.h"
 #include "chrome/grit/locale_settings.h"
 #include "chrome/grit/theme_resources.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 "components/omnibox/browser/omnibox_popup_model.h"
 #include "components/omnibox/browser/omnibox_popup_view.h"
@@ -2597,7 +2597,7 @@ bool BrowserView::DoCutCopyPasteForWebContents(
 
 void BrowserView::ActivateAppModalDialog() const {
   // If another browser is app modal, flash and activate the modal browser.
-  app_modal::AppModalDialog* active_dialog =
+  app_modal::JavaScriptAppModalDialog* active_dialog =
       app_modal::AppModalDialogQueue::GetInstance()->active_dialog();
   if (!active_dialog)
     return;