Revert of Move content/browser/power_save_blocker to //device/power_save_blocker

device/power_save_blocker/power_save_blocker_ozone.cc

-// Copyright 2013 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 "device/power_save_blocker/power_save_blocker_impl.h"
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-
-namespace device {
-
-// TODO(derat): Consider renaming this file; '_ozone' is a misnomer as power
-// save is OS-specific, not display-system-specific.  This implementation
-// ends up being used for non-ChromeOS Ozone platforms such as Chromecast.
-// See crbug.com/495661 for more detail.
-class PowerSaveBlockerImpl::Delegate
-    : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
- public:
-  Delegate() {}
-
- private:
-  friend class base::RefCountedThreadSafe<Delegate>;
-  virtual ~Delegate() {}
-
-  DISALLOW_COPY_AND_ASSIGN(Delegate);
-};
-
-PowerSaveBlockerImpl::PowerSaveBlockerImpl(
-    PowerSaveBlockerType type,
-    Reason reason,
-    const std::string& description,
-    scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> blocking_task_runner)
-    : delegate_(new Delegate()),
-      ui_task_runner_(ui_task_runner),
-      blocking_task_runner_(blocking_task_runner) {}
-
-PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {}
-
-}  // namespace device