Update from https://crrev.com/315085

base/memory/scoped_open_process.h

-// 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.
-
-#ifndef BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
-#define BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
-
-#include "base/process/process_handle.h"
-
-namespace base {
-
-// A class that opens a process from its process id and closes it when the
-// instance goes out of scope.
-class ScopedOpenProcess {
- public:
-  ScopedOpenProcess() : handle_(kNullProcessHandle) {
-  }
-
-  // Automatically close the process.
-  ~ScopedOpenProcess() {
-    Close();
-  }
-
-  // Open a new process by pid. Closes any previously opened process (even if
-  // opening the new one fails).
-  bool Open(ProcessId pid) {
-    Close();
-    return OpenProcessHandle(pid, &handle_);
-  }
-
-  // Close the previously opened process.
-  void Close() {
-    if (handle_ == kNullProcessHandle)
-      return;
-
-    CloseProcessHandle(handle_);
-    handle_ = kNullProcessHandle;
-  }
-
-  ProcessHandle handle() const { return handle_; }
-
- private:
-  ProcessHandle handle_;
-  DISALLOW_COPY_AND_ASSIGN(ScopedOpenProcess);
-};
-}  // namespace base
-
-#endif  // BASE_MEMORY_SCOPED_OPEN_PROCESS_H_