Get url_request_unittest.cc to build on Linux.

net/net_unittests.scons

 # 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.
 
 __doc__ = """
 Configuration for building the net_unittests{,.exe} executable.
 """
 
 Import('env')
 
@@ skipping 101 matching lines @@
       'http/http_transaction_winhttp_unittest.cc',
       'http/winhttp_request_throttle_unittest.cc',
       'url_request/url_request_unittest.cc',
   ])
 
 if env['PLATFORM'] == 'darwin':
   input_files.extend([
       '../base/platform_test_mac$OBJSUFFIX',
   ])
 
+if env['PLATFORM'] == 'posix':
+  input_files.extend([
+      'url_request/url_request_unittest.cc',
+  ])
+
 if env['PLATFORM'] in ('darwin', 'posix'):
   input_files.extend([
       'base/ssl_client_socket_unittest.cc',
   ])
 
 net_unittests = env.ChromeTestProgram('net_unittests', input_files)
 
 installed_test = env.Install('$TARGET_ROOT', net_unittests)
 
 env.Alias('net', installed_test)