Revert cl 9528 to fix mac test_shell_tests

net/http/http_transaction_unittest.h

 // Copyright (c) 2006-2008 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_HTTP_HTTP_TRANSACTION_UNITTEST_H_
 #define NET_HTTP_HTTP_TRANSACTION_UNITTEST_H_
 
 #include "net/http/http_transaction.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
-#include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/load_flags.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_info.h"
 
 //-----------------------------------------------------------------------------
 // mock transaction data
@@ skipping 279 matching lines @@
 };
 
 
 //-----------------------------------------------------------------------------
 // helpers
 
 // read the transaction completely
 int ReadTransaction(net::HttpTransaction* trans, std::string* result);
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_UNITTEST_H_