chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/login/signin/merge_session_load_page.h

 // Copyright 2014 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_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_LOAD_PAGE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_LOAD_PAGE_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/signin/merge_session_throttling_utils.h"
 #include "chrome/browser/chromeos/login/signin/oauth2_login_manager.h"
 #include "content/public/browser/interstitial_page_delegate.h"
 #include "url/gurl.h"
 
-namespace base {
-class DictionaryValue;
-}
-
 namespace content {
 class InterstitialPage;
 class WebContents;
 }
 
-namespace extensions {
-class Extension;
-}
-
 namespace chromeos {
 
 // MergeSessionLoadPage class shows the interstitial page that is shown
 // while we are trying to restore session containing tabs with Google properties
 // during the process of exchanging OAuth2 refresh token for user cookies.
 // It deletes itself when the interstitial page is closed.
 class MergeSessionLoadPage
     : public content::InterstitialPageDelegate,
       public OAuth2LoginManager::Observer {
  public:
@@ skipping 37 matching lines @@
   content::WebContents* web_contents_;
   GURL url_;
   content::InterstitialPage* interstitial_page_;  // Owns us.
 
   DISALLOW_COPY_AND_ASSIGN(MergeSessionLoadPage);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_LOAD_PAGE_H_