Enable sdch_filter_unittest to run on Linux

net/net.gyp

 # Copyright (c) 2010 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 1002 matching lines @@
         ['chromeos==1', {
           'sources!': [
              'proxy/proxy_config_service_linux_unittest.cc',
           ],
         }],
         [ 'OS == "linux" or OS == "freebsd" or OS == "openbsd"', {
             'dependencies': [
               '../build/linux/system.gyp:gtk',
               '../build/linux/system.gyp:nss',
             ],
-            'sources!': [
-              'base/sdch_filter_unittest.cc',
-            ],
           },
           {  # else: OS is not in the above list
             'sources!': [
               'base/cert_database_nss_unittest.cc',
             ],
           }
         ],
         [ 'OS == "linux"', {
           'conditions': [
             ['linux_use_tcmalloc==1', {
@@ skipping 427 matching lines @@
       ],
     }],
   ],
 }
 
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