Parent the AppInfoDialog using a ModalDialogHost

chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h

Index: chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h
diff --git a/chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h b/chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h
index 51e691b1e40d910e228f85f5b22d08497bdfb71f..0401a14d9893be3c07521fc5747cfa7ba7154420 100644
--- a/chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h
+++ b/chrome/browser/ui/views/apps/app_info_dialog/app_info_dialog_views.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_UI_VIEWS_APPS_APP_INFO_DIALOG_APP_INFO_DIALOG_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_APPS_APP_INFO_DIALOG_APP_INFO_DIALOG_VIEWS_H_
 
+#include "components/web_modal/modal_dialog_host.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/view.h"
@@ -25,9 +26,10 @@ class ScrollView;
 // |extension| in the member variables in this class and all AppInfoPanel
 // classes.
 class AppInfoDialog : public views::View,
-                      public extensions::ExtensionRegistryObserver {
+                      public extensions::ExtensionRegistryObserver,
+                      public web_modal::ModalDialogHostObserver {
  public:
-  AppInfoDialog(gfx::NativeWindow parent_window,
+  AppInfoDialog(web_modal::ModalDialogHost* host,
                 Profile* profile,
                 const extensions::Extension* app);
   ~AppInfoDialog() override;
@@ -45,6 +47,10 @@ class AppInfoDialog : public views::View,
                               extensions::UninstallReason reason) override;
   void OnShutdown(extensions::ExtensionRegistry* registry) override;
 
+  // Overridden from web_modal::ModalDialogHostObserver:
+  void OnPositionRequiresUpdate() override;
+  void OnHostDestroying() override;
+
   // UI elements of the dialog.
   views::View* dialog_header_;
   views::ScrollView* dialog_body_;