ifdef out ProcessUtilTest.CloneFlags on linux with old kernel headers

base/process/process_util_unittest.cc

Index: base/process/process_util_unittest.cc
diff --git a/base/process/process_util_unittest.cc b/base/process/process_util_unittest.cc
index 1f7f1b2c776edcfe2942c7564a74a209942804ec..be1a00045965796273b4cde923215c639440005b 100644
--- a/base/process/process_util_unittest.cc
+++ b/base/process/process_util_unittest.cc
@@ -1025,6 +1025,7 @@ MULTIPROCESS_TEST_MAIN(CheckPidProcess) {
   return kSuccess;
 }
 
+#if defined(CLONE_NEWUSER) && defined(CLONE_NEWPID)
 TEST_F(ProcessUtilTest, CloneFlags) {
   if (RunningOnValgrind() ||
       !base::PathExists(FilePath("/proc/self/ns/user")) ||
@@ -1043,6 +1044,7 @@ TEST_F(ProcessUtilTest, CloneFlags) {
   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