Reland of 'Move content/browser/power_save_blocker to //device/power_save_blocker'

device/power_save_blocker/power_save_blocker.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
-#define CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
+#ifndef DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_
+#define DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
-#include "content/common/content_export.h"
+#include "device/power_save_blocker/power_save_blocker_export.h"
 
-namespace content {
+namespace device {
 
 // A RAII-style class to block the system from entering low-power (sleep) mode.
 // This class is thread-safe; it may be constructed and deleted on any thread.
-class CONTENT_EXPORT PowerSaveBlocker {
+class DEVICE_POWER_SAVE_BLOCKER_EXPORT PowerSaveBlocker {
  public:
   enum PowerSaveBlockerType {
     // Prevent the application from being suspended. On some platforms, apps may
     // be suspended when they are not visible to the user. This type of block
     // requests that the app continue to run in that case, and on all platforms
     // prevents the system from sleeping.
     // Example use cases: downloading a file, playing audio.
     kPowerSaveBlockPreventAppSuspension,
 
     // Prevent the display from going to sleep. This also has the side effect of
@@ skipping 21 matching lines @@
   // the blocking) may be provided to the underlying system APIs on some
   // platforms.
   static std::unique_ptr<PowerSaveBlocker> CreateWithTaskRunners(
       PowerSaveBlockerType type,
       Reason reason,
       const std::string& description,
       scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
 };
 
-}  // namespace content
+}  // namespace device
 
-#endif  // CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
+#endif  // DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_