Cleanup: IWYU for browser_navigator.h and browser_navigator_params.h.

chrome/browser/ui/browser_navigator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_NAVIGATOR_H_
 #define CHROME_BROWSER_UI_BROWSER_NAVIGATOR_H_
 
-// TODO(thestig) Forward declare this and do IWYU.
-#include "chrome/browser/ui/browser_navigator_params.h"
-
 class GURL;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace chrome {
 
+struct NavigateParams;
+
 // Navigates according to the configuration specified in |params|.
 void Navigate(NavigateParams* params);
 
 // Returns true if the url is allowed to open in incognito window.
 bool IsURLAllowedInIncognito(const GURL& url,
                              content::BrowserContext* browser_context);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_NAVIGATOR_H_