Update from https://crrev.com/312398

base/process/process_posix.cc

 // Copyright (c) 2011 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 "base/process/process.h"
 
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 
@@ skipping 20 matching lines @@
 }
 
 // static
 Process Process::Current() {
   Process process;
   process.process_ = GetCurrentProcessHandle();
   return process.Pass();
 }
 
 // static
+Process Process::OpenWithExtraPriviles(ProcessId pid) {
+  if (pid == GetCurrentProcId())
+    return Current();
+
+  // On POSIX process handles are the same as PIDs, and there are no privileges
+  // to set.
+  return Process(pid);
+}
+
+// static
 Process Process::DeprecatedGetProcessFromHandle(ProcessHandle handle) {
   DCHECK_NE(handle, GetCurrentProcessHandle());
   return Process(handle);
 }
 
 #if !defined(OS_LINUX)
 // static
 bool Process::CanBackgroundProcesses() {
   return false;
 }
@@ skipping 65 matching lines @@
   return false;
 }
 #endif  // !defined(OS_LINUX)
 
 int Process::GetPriority() const {
   DCHECK(IsValid());
   return getpriority(PRIO_PROCESS, process_);
 }
 
 }  // namspace base