Remove DialogDelegate::UseNewStyle and unused code.

chrome/browser/ui/views/pdf_password_dialog.cc

Index: chrome/browser/ui/views/pdf_password_dialog.cc
diff --git a/chrome/browser/ui/views/pdf_password_dialog.cc b/chrome/browser/ui/views/pdf_password_dialog.cc
index 47bc834011bc639a97646d0d34d8ebdb93e24b24..b91305356f777aa2438df0ef7c59dee65e059291 100644
--- a/chrome/browser/ui/views/pdf_password_dialog.cc
+++ b/chrome/browser/ui/views/pdf_password_dialog.cc
@@ -9,7 +9,6 @@
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/browser/web_contents_view.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/controls/message_box_view.h"
@@ -80,9 +79,7 @@ PDFPasswordDialogViews::PDFPasswordDialogViews(
       web_contents_modal_dialog_manager->delegate();
   DCHECK(modal_delegate);
   dialog_ = views::Widget::CreateWindowAsFramelessChild(
-      this,
-      web_contents->GetView()->GetNativeView(),
-      modal_delegate->GetWebContentsModalDialogHost()->GetHostView());
+      this, modal_delegate->GetWebContentsModalDialogHost()->GetHostView());
   web_contents_modal_dialog_manager->ShowDialog(dialog_->GetNativeView());
 }