chrome: Cleanup class/struct forward declarations

chrome/browser/captive_portal/captive_portal_tab_helper.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_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_HELPER_H_
 #define CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_HELPER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/captive_portal/captive_portal_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "content/public/common/resource_type.h"
 
-class GURL;
 class Profile;
 
 namespace content {
 class NavigationHandle;
 class WebContents;
 }
 
 namespace net {
 class SSLInfo;
 }
@@ skipping 86 matching lines @@
   // Neither of these will ever be NULL.
   std::unique_ptr<CaptivePortalTabReloader> tab_reloader_;
   std::unique_ptr<CaptivePortalLoginDetector> login_detector_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(CaptivePortalTabHelper);
 };
 
 #endif  // CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_HELPER_H_