Decouple Power Monitor from //content.

content/browser/power_monitor_message_broadcaster.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 "content/browser/power_monitor_message_broadcaster.h"
-
-#include "base/power_monitor/power_monitor.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
-
-namespace content {
-
-PowerMonitorMessageBroadcaster::PowerMonitorMessageBroadcaster() {
-  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
-  if (power_monitor)
-    power_monitor->AddObserver(this);
-}
-
-PowerMonitorMessageBroadcaster::~PowerMonitorMessageBroadcaster() {
-  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
-  if (power_monitor)
-    power_monitor->RemoveObserver(this);
-}
-
-// static
-void PowerMonitorMessageBroadcaster::Create(
-    device::mojom::PowerMonitorRequest request) {
-  mojo::MakeStrongBinding(base::MakeUnique<PowerMonitorMessageBroadcaster>(),
-                          std::move(request));
-}
-
-void PowerMonitorMessageBroadcaster::SetClient(
-    device::mojom::PowerMonitorClientPtr power_monitor_client) {
-  power_monitor_client_ = std::move(power_monitor_client);
-  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
-  // Unit tests does not initialize the PowerMonitor.
-  if (power_monitor)
-    OnPowerStateChange(power_monitor->IsOnBatteryPower());
-}
-
-void PowerMonitorMessageBroadcaster::OnPowerStateChange(bool on_battery_power) {
-  if (power_monitor_client_) {
-    power_monitor_client_->PowerStateChange(on_battery_power);
-  }
-}
-
-void PowerMonitorMessageBroadcaster::OnSuspend() {
-  if (power_monitor_client_) {
-    power_monitor_client_->Suspend();
-  }
-}
-
-void PowerMonitorMessageBroadcaster::OnResume() {
-  if (power_monitor_client_) {
-    power_monitor_client_->Resume();
-  }
-}
-
-}  // namespace content