Use a uniform opaque type to represent web contents modal dialogs

chrome/browser/ui/web_contents_modal_dialog.h

Index: chrome/browser/ui/web_contents_modal_dialog.h
diff --git a/chrome/browser/ui/web_contents_modal_dialog.h b/chrome/browser/ui/web_contents_modal_dialog.h
index 90f85885c7c39d9241c94c6bd04842ca14615270..f05264551a7361a5e5365de0cbf4ef813b2e5957 100644
--- a/chrome/browser/ui/web_contents_modal_dialog.h
+++ b/chrome/browser/ui/web_contents_modal_dialog.h
@@ -5,8 +5,7 @@
 #ifndef CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_H_
 #define CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_H_
 
-#include "build/build_config.h"
-#include "ui/gfx/native_widget_types.h"
+#include "chrome/browser/ui/native_web_contents_modal_dialog.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 // WebContentsModalDialog
@@ -29,8 +28,8 @@ class WebContentsModalDialog {
   // Runs a pulse animation for the web contents modal dialog.
   virtual void PulseWebContentsModalDialog() = 0;
 
-  // Returns the native window of the web contents modal dialog.
-  virtual gfx::NativeWindow GetNativeWindow() = 0;
+  // Returns the native representation of the web contents modal dialog.
+  virtual NativeWebContentsModalDialog GetNativeDialog() = 0;
 
  protected:
   virtual ~WebContentsModalDialog() {}