Update from https://crrev.com/315085

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>
 
 #include "base/logging.h"
 #include "base/process/kill.h"
 
 namespace base {
 
 Process::Process(ProcessHandle handle) : process_(handle) {
-  CHECK_NE(handle, GetCurrentProcessHandle());
 }
 
 Process::Process(RValue other)
     : process_(other.object->process_) {
   other.object->Close();
 }
 
 Process& Process::operator=(RValue other) {
   if (this != other.object) {
     process_ = other.object->process_;
     other.object->Close();
   }
   return *this;
 }
 
 // static
 Process Process::Current() {
-  Process process;
-  process.process_ = GetCurrentProcessHandle();
-  return process.Pass();
+  return Process(GetCurrentProcessHandle());
+}
+
+// static
+Process Process::Open(ProcessId pid) {
+  if (pid == GetCurrentProcId())
+    return Current();
+
+  // On POSIX process handles are the same as PIDs.
+  return Process(pid);
 }
 
 // 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);
+  // On POSIX there are no privileges to set.
+  return Open(pid);
 }
 
 // static
 Process Process::DeprecatedGetProcessFromHandle(ProcessHandle handle) {
   DCHECK_NE(handle, GetCurrentProcessHandle());
   return Process(handle);
 }
 
 #if !defined(OS_LINUX)
 // static
@@ skipping 68 matching lines @@
   return false;
 }
 #endif  // !defined(OS_LINUX)
 
 int Process::GetPriority() const {
   DCHECK(IsValid());
   return getpriority(PRIO_PROCESS, process_);
 }
 
 }  // namspace base