Use xdg_user_dir_lookup to lookup directories.

chrome/common/common.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.
 
 Import('env')
 
 env = env.Clone()
 
 env.SConscript([
     '$BREAKPAD_DIR/using_breakpad.scons',
@@ skipping 265 matching lines @@
       'ipc_channel_posix.cc',
   )
 
 if env.Bit('windows'):
   input_files.Append(
       'transport_dib_win.cc'
   )
 
 if env.Bit('linux'):
   input_files.Append(
+      '$CHROME_DIR/third_party/xdg_user_dirs/xdg_user_dir_lookup.cc',
       'transport_dib_linux.cc',
       'x11_util.cc'
   )
 
 if env.Bit('mac'):
   input_files.Append(
       'transport_dib_mac.cc'
   )
 
 if not env.Bit('mac'):
@@ skipping 45 matching lines @@
                 './common.vsprops',
                 '$(SolutionDir)../build/release.vsprops',
             ])
 
 p.AddFileConfig('../tools/build/win/precompiled.cc',
                 'Debug|Win32',
                 tools=[
                     MSVSTool('VCCLCompilerTool',
                              UsePrecompiledHeader='1'),
                 ])