Make sure ShellIntegration::CommandLineArgsForLauncher respects the UserDataDir policy.

chrome/browser/policy/policy_path_parser_linux.cc

 // Copyright (c) 2012 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.
 
 #include <pwd.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "chrome/browser/policy/policy_path_parser.h"
 
@@ skipping 35 matching lines @@
     char machinename[255];
     if (gethostname(machinename, 255) == 0) {
       result.replace(position, strlen(kMachineNamePolicyVarName), machinename);
     } else {
       LOG(ERROR) << "Machine name variable can not be resolved.";
     }
   }
   return result;
 }
 
+void CheckUserDataDirPolicy(base::FilePath* user_data_dir) {
+  // This function is not implemented in Linux because we don't support the
+  // policy on this platform.
+  NOTREACHED();
+}
+
 }  // namespace path_parser
 
 }  // namespace policy