Prerender: remove tiny leftovers from refactoring

chrome/browser/prerender/prerender_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_PRERENDER_PRERENDER_TAB_HELPER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "chrome/browser/prerender/prerender_histograms.h"
 #include "chrome/browser/prerender/prerender_origin.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "url/gurl.h"
 
-namespace autofill {
-struct PasswordForm;
-}
-
-namespace password_manager {
-class PasswordManager;
-}
-
 namespace prerender {
 
 class PrerenderManager;
 
 // PrerenderTabHelper is responsible for recording perceived pageload times
 // to compare PLT's with prerendering enabled and disabled.
 class PrerenderTabHelper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<PrerenderTabHelper> {
  public:
@@ skipping 67 matching lines @@
   GURL url_;
 
   base::WeakPtrFactory<PrerenderTabHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_