Revert of Move ForkWithFlags from sandbox/ to base/ and plug it into LaunchProcess.

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 666 matching lines @@
 
   env_changes[kBaseTest] = "wibble";
   EXPECT_EQ("wibble\n",
             TestLaunchProcess(
                 echo_base_test, env_changes, no_clear_environ, no_clone_flags));
 
 #if defined(OS_LINUX)
   // Test a non-trival value for clone_flags.
   // Don't test on Valgrind as it has limited support for clone().
   if (!RunningOnValgrind()) {
-    EXPECT_EQ("wibble\n", TestLaunchProcess(echo_base_test, env_changes,
-                                            no_clear_environ, CLONE_FS));
+    EXPECT_EQ(
+        "wibble\n",
+        TestLaunchProcess(
+            echo_base_test, env_changes, no_clear_environ, CLONE_FS | SIGCHLD));
   }
 
   EXPECT_EQ(
       "BASE_TEST=wibble\n",
       TestLaunchProcess(
           print_env, env_changes, true /* clear_environ */, no_clone_flags));
   env_changes.clear();
   EXPECT_EQ(
       "",
       TestLaunchProcess(
@@ skipping 213 matching lines @@
 
   // Check that process was really killed.
   EXPECT_TRUE(IsProcessDead(child_process.Handle()));
 }
 
 MULTIPROCESS_TEST_MAIN(process_util_test_die_immediately) {
   return 0;
 }
 
 #endif  // defined(OS_POSIX)