ios: Cleanup class/struct forward declarations

ios/chrome/browser/ssl/ios_ssl_blocking_page.h

 // Copyright 2016 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 IOS_CHROME_BROWSER_SSL_IOS_SSL_BLOCKING_PAGE_H_
 #define IOS_CHROME_BROWSER_SSL_IOS_SSL_BLOCKING_PAGE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "ios/chrome/browser/interstitials/ios_security_interstitial_page.h"
 #include "net/ssl/ssl_info.h"
 
 class IOSChromeControllerClient;
 class GURL;
 
-namespace ios {
-class ChromeBrowserState;
-}
-
 namespace security_interstitials {
 class SSLErrorUI;
 }
 
 // This class is responsible for showing/hiding the interstitial page that is
 // shown when a certificate error happens.
 // It deletes itself when the interstitial page is closed.
 class IOSSSLBlockingPage : public IOSSecurityInterstitialPage {
  public:
   ~IOSSSLBlockingPage() override;
@@ skipping 37 matching lines @@
   // expired.
   const bool expired_but_previously_allowed_;
 
   std::unique_ptr<IOSChromeControllerClient> controller_;
   std::unique_ptr<security_interstitials::SSLErrorUI> ssl_error_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSSSLBlockingPage);
 };
 
 #endif  // IOS_CHROME_BROWSER_SSL_IOS_SSL_BLOCKING_PAGE_H_