Place browser-modal dialogs like web-contents-modal dialogs.

chrome/browser/chromeos/ui/echo_dialog_view.cc

Index: chrome/browser/chromeos/ui/echo_dialog_view.cc
diff --git a/chrome/browser/chromeos/ui/echo_dialog_view.cc b/chrome/browser/chromeos/ui/echo_dialog_view.cc
index 15b8ed8e1df8676a60c82082928a14f4bc44150d..9185b40638c0d7ce5c13ca733e43d51c9cac4b3c 100644
--- a/chrome/browser/chromeos/ui/echo_dialog_view.cc
+++ b/chrome/browser/chromeos/ui/echo_dialog_view.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/chromeos/ui/echo_dialog_view.h"
 
 #include "chrome/browser/chromeos/ui/echo_dialog_listener.h"
+#include "chrome/browser/ui/views/constrained_window_views.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/font.h"
@@ -95,7 +96,7 @@ void EchoDialogView::InitForDisabledEcho() {
 void EchoDialogView::Show(gfx::NativeWindow parent) {
   DCHECK(cancel_button_label_id_);
 
-  views::DialogDelegate::CreateDialogWidget(this, parent, parent);
+  CreateBrowserModalDialogViews(this, parent);
   GetWidget()->SetSize(GetWidget()->GetRootView()->GetPreferredSize());
   GetWidget()->Show();
 }