Cleanup: Remove unneeded forward declararations in net.

net/proxy/proxy_script_fetcher_impl.h

 // Copyright (c) 2011 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 NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_
 #define NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_
 #pragma once
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/task.h"
 #include "base/time.h"
 #include "net/proxy/proxy_script_fetcher.h"
 #include "net/url_request/url_request.h"
 
 class GURL;
-class X509Certificate;
 
 namespace net {
 
 class URLRequestContext;
 
 // Implementation of ProxyScriptFetcher that downloads scripts using the
 // specified request context.
 class NET_EXPORT ProxyScriptFetcherImpl : public ProxyScriptFetcher,
                                           public URLRequest::Delegate {
  public:
@@ skipping 87 matching lines @@
 
   // The maximum amount of time to wait for download to complete.
   base::TimeDelta max_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyScriptFetcherImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_