[Ozone-Drm] Remove GPU lock

ui/ozone/platform/drm/gpu/gpu_lock.cc

-// Copyright 2015 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 "ui/ozone/platform/drm/gpu/gpu_lock.h"
-
-#include <sys/file.h>
-#include <unistd.h>
-
-#include "base/logging.h"
-#include "base/posix/eintr_wrapper.h"
-
-namespace ui {
-
-namespace {
-const char kGpuLockFile[] = "/run/frecon";
-}
-
-GpuLock::GpuLock() {
-  fd_ = open(kGpuLockFile, O_RDWR);
-  if (fd_ < 0) {
-    PLOG(ERROR) << "Failed to open lock file '" << kGpuLockFile << "'";
-    return;
-  }
-
-  VLOG(1) << "Taking write lock on '" << kGpuLockFile << "'";
-  if (HANDLE_EINTR(flock(fd_, LOCK_EX)))
-    PLOG(ERROR) << "Error while trying to get lock on '" << kGpuLockFile << "'";
-
-  VLOG(1) << "Done trying to take write lock on '" << kGpuLockFile << "'";
-}
-
-GpuLock::~GpuLock() {
-  // Failed to open the lock file, so nothing to do here.
-  if (fd_ < 0)
-    return;
-
-  VLOG(1) << "Releasing write lock on '" << kGpuLockFile << "'";
-  close(fd_);
-}
-
-}  // namespace ui