implement things needed to run net/disk_cache/backend_unittest

net/SConscript

 # 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.
 
 Import('env')
 
 env_res = env.Clone()
 env_tests = env.Clone()
 env = env.Clone()
 
@@ skipping 205 matching lines @@
     'base/data_url_unittest.cc',
     'base/escape_unittest.cc',
     'base/gzip_filter_unittest.cc',
     'base/host_resolver_unittest.cc',
     'base/mime_sniffer_unittest.cc',
     'base/mime_util_unittest.cc',
     'base/net_util_unittest.cc',
     'base/registry_controlled_domain_unittest.cc',
     'base/run_all_unittests.cc',
     'disk_cache/addr_unittest.cc',
+    'disk_cache/backend_unittest.cc',
     'disk_cache/block_files_unittest.cc',
     'disk_cache/disk_cache_test_base.cc',
     'disk_cache/disk_cache_test_util.cc',
     'disk_cache/entry_unittest.cc',
     'disk_cache/mapped_file_unittest.cc',
     'disk_cache/storage_block_unittest.cc',
     'http/http_chunked_decoder_unittest.cc',
     'http/http_response_headers_unittest.cc',
     'http/http_vary_data_unittest.cc',
 ]
 
 if env['PLATFORM'] == 'win32':
   unittest_files.extend([
       'base/cookie_policy_unittest.cc',
       'base/directory_lister_unittest.cc',
       'base/ssl_config_service_unittest.cc',
       'base/ssl_client_socket_unittest.cc',
       'base/tcp_client_socket_unittest.cc',
       'base/wininet_util_unittest.cc',
-      'disk_cache/backend_unittest.cc',
       'http/http_cache_unittest.cc',
       'http/http_network_layer_unittest.cc',
       'http/http_network_transaction_unittest.cc',
       'http/http_transaction_unittest.cc',
       'http/http_transaction_winhttp_unittest.cc',
       'http/http_util_unittest.cc',
       'http/winhttp_request_throttle_unittest.cc',
       'url_request/url_request_unittest.cc',
   ])
 
@@ skipping 71 matching lines @@
 
   SConscript(sconscript_files, exports=['env'])
 
 
 # Setup alias for building all parts of net.
 if env['PLATFORM'] == 'win32':
   icudata = '../icudt38.dll'
 else:
   icudata = '../icudt38l.dat'
 env.Alias('net', ['.', installed_tests, icudata])