ifdef out ProcessUtilTest.CloneFlags on linux with old kernel headers

base/process/process_util_unittest.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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 1007 matching lines @@
 const int kSuccess = 0;
 
 MULTIPROCESS_TEST_MAIN(CheckPidProcess) {
   const pid_t kInitPid = 1;
   const pid_t pid = syscall(__NR_getpid);
   CHECK(pid == kInitPid);
   CHECK(getpid() == pid);
   return kSuccess;
 }
 
+#if defined(CLONE_NEWUSER) && defined(CLONE_NEWPID)
 TEST_F(ProcessUtilTest, CloneFlags) {
   if (RunningOnValgrind() ||
       !base::PathExists(FilePath("/proc/self/ns/user")) ||
       !base::PathExists(FilePath("/proc/self/ns/pid"))) {
     // User or PID namespaces are not supported.
     return;
   }
 
   base::LaunchOptions options;
   options.clone_flags = CLONE_NEWUSER | CLONE_NEWPID;
 
   base::Process process(SpawnChildWithOptions("CheckPidProcess", options));
   ASSERT_TRUE(process.IsValid());
 
   int exit_code = 42;
   EXPECT_TRUE(process.WaitForExit(&exit_code));
   EXPECT_EQ(kSuccess, exit_code);
 }
+#endif
 
 TEST(ForkWithFlagsTest, UpdatesPidCache) {
   // The libc clone function, which allows ForkWithFlags to keep the pid cache
   // up to date, does not work on Valgrind.
   if (RunningOnValgrind()) {
     return;
   }
 
   // Warm up the libc pid cache, if there is one.
   ASSERT_EQ(syscall(__NR_getpid), getpid());
@@ skipping 47 matching lines @@
   options.current_directory = base::FilePath("/dev/null");
 
   base::Process process(SpawnChildWithOptions("SimpleChildProcess", options));
   ASSERT_TRUE(process.IsValid());
 
   int exit_code = kSuccess;
   EXPECT_TRUE(process.WaitForExit(&exit_code));
   EXPECT_NE(kSuccess, exit_code);
 }
 #endif