Split ProcessHandle and its related routines into base/process/process_handle.h.

base/process_util_mac.mm

Index: base/process_util_mac.mm
diff --git a/base/process_util_mac.mm b/base/process_util_mac.mm
index c82cd50d330f01936fa90fb459f64ec44f90939a..964a3d20aa7295b3ea2bddac6864bac4133c5af7 100644
--- a/base/process_util_mac.mm
+++ b/base/process_util_mac.mm
@@ -57,17 +57,4 @@ void RestoreDefaultExceptionHandler() {
                            EXCEPTION_DEFAULT, THREAD_STATE_NONE);
 }
 
-ProcessId GetParentProcessId(ProcessHandle process) {
-  struct kinfo_proc info;
-  size_t length = sizeof(struct kinfo_proc);
-  int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process };
-  if (sysctl(mib, 4, &info, &length, NULL, 0) < 0) {
-    DPLOG(ERROR) << "sysctl";
-    return -1;
-  }
-  if (length == 0)
-    return -1;
-  return info.kp_eproc.e_ppid;
-}
-
 }  // namespace base