chrome: Cleanup class/struct forward declarations

chrome/browser/ui/omnibox/chrome_omnibox_navigation_observer.h

 // Copyright 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_OMNIBOX_CHROME_OMNIBOX_NAVIGATION_OBSERVER_H_
 #define CHROME_BROWSER_UI_OMNIBOX_CHROME_OMNIBOX_NAVIGATION_OBSERVER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/omnibox_navigation_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/reload_type.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
 class Profile;
 class ShortcutsBackend;
 
 namespace net {
 class URLFetcher;
-class URLRequestStatus;
 }
 
 // Monitors omnibox navigations in order to trigger behaviors that depend on
 // successful navigations.
 //
 // Currently two such behaviors exist:
 // (1) For single-word queries where we can't tell if the entry was a search or
 //     an intranet hostname, the omnibox opens as a search by default, but this
 //     class attempts to open as a URL via an HTTP HEAD request.  If successful,
 //     displays an infobar once the search result has also loaded.  See
@@ skipping 69 matching lines @@
   std::unique_ptr<net::URLFetcher> fetcher_;
   LoadState load_state_;
   FetchState fetch_state_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeOmniboxNavigationObserver);
 };
 
 #endif  // CHROME_BROWSER_UI_OMNIBOX_CHROME_OMNIBOX_NAVIGATION_OBSERVER_H_