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

device/power_save_blocker/power_save_blocker.gyp

+# Copyright 2016 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [
+    {
+      # GN version: //device/power_save_blocker
+      'target_name': 'device_power_save_blocker',
+      'type': '<(component)',
+      'dependencies': [
+        '../../base/base.gyp:base',
+      ],
+      'defines': [
+        'DEVICE_POWER_SAVE_BLOCKER_IMPLEMENTATION',
+      ],
+      'sources': [
+        # Note: file list duplicated in GN build, other than Android, as gyp
+        # for Android isn't supported.
+        'power_save_blocker.h',
+        'power_save_blocker_chromeos.cc',
+        'power_save_blocker_impl.cc',
+        'power_save_blocker_impl.h',
+        'power_save_blocker_mac.cc',
+        'power_save_blocker_ozone.cc',
+        'power_save_blocker_win.cc',
+        'power_save_blocker_x11.cc',
+      ],
+      'conditions': [
+        ['chromeos==1', {
+          'sources!': [
+            'power_save_blocker_ozone.cc',
+            'power_save_blocker_x11.cc',
+          ],
+          'dependencies': [
+            '../../chromeos/chromeos.gyp:chromeos',
+            '../../chromeos/chromeos.gyp:power_manager_proto',
+          ],
+        }],
+        ['OS == "mac"', {
+          'link_settings': {
+            'libraries': [
+              '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
+              '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
+            ],
+          },
+        }],
+      ],
+    },
+  ],
+}