chrome: Cleanup class/struct forward declarations

chrome/browser/ssl/ssl_client_auth_requestor_mock.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_SSL_SSL_CLIENT_AUTH_REQUESTOR_MOCK_H_
 #define CHROME_BROWSER_SSL_SSL_CLIENT_AUTH_REQUESTOR_MOCK_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace content {
 class ClientCertificateDelegate;
 }
 
 namespace net {
-class HttpNetworkSession;
 class SSLCertRequestInfo;
 class URLRequest;
 class X509Certificate;
 }
 
 class SSLClientAuthRequestorMock
     : public base::RefCountedThreadSafe<SSLClientAuthRequestorMock> {
  public:
   SSLClientAuthRequestorMock(
       net::URLRequest* request,
       const scoped_refptr<net::SSLCertRequestInfo>& cert_request_info);
 
   std::unique_ptr<content::ClientCertificateDelegate> CreateDelegate();
 
   MOCK_METHOD1(CertificateSelected, void(net::X509Certificate* cert));
   MOCK_METHOD0(CancelCertificateSelection, void());
 
   scoped_refptr<net::SSLCertRequestInfo> cert_request_info_;
 
  protected:
   friend class base::RefCountedThreadSafe<SSLClientAuthRequestorMock>;
   virtual ~SSLClientAuthRequestorMock();
 };
 
 #endif  // CHROME_BROWSER_SSL_SSL_CLIENT_AUTH_REQUESTOR_MOCK_H_