net: Cleanup class/struct forward declarations

net/url_request/url_request.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 NET_URL_REQUEST_URL_REQUEST_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 22 matching lines @@
 #include "net/http/http_response_info.h"
 #include "net/log/net_log_with_source.h"
 #include "net/proxy/proxy_server.h"
 #include "net/socket/connection_attempts.h"
 #include "net/url_request/url_request_status.h"
 #include "url/gurl.h"
 #include "url/origin.h"
 
 namespace base {
 class Value;
-
-namespace debug {
-class StackTrace;
-}  // namespace debug
 }  // namespace base
 
 namespace net {
 
 class CookieOptions;
 class HostPortPair;
 class IOBuffer;
 struct LoadTimingInfo;
 struct RedirectInfo;
 class SSLCertRequestInfo;
@@ skipping 799 matching lines @@
 
   // The raw header size of the response.
   int raw_header_size_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_