Reland "Replace Chrome IPC with Mojo IPC for querying BatteryStatus service"

content/browser/battery_status/battery_status_message_filter.cc

Index: content/browser/battery_status/battery_status_message_filter.cc
diff --git a/content/browser/battery_status/battery_status_message_filter.cc b/content/browser/battery_status/battery_status_message_filter.cc
deleted file mode 100644
index 19a21b80787290868214061a2f215eef27c4e113..0000000000000000000000000000000000000000
--- a/content/browser/battery_status/battery_status_message_filter.cc
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2014 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/battery_status/battery_status_message_filter.h"
-
-#include "content/common/battery_status_messages.h"
-
-namespace content {
-
-BatteryStatusMessageFilter::BatteryStatusMessageFilter()
-    : BrowserMessageFilter(BatteryStatusMsgStart),
-      is_started_(false) {
-  callback_ = base::Bind(&BatteryStatusMessageFilter::SendBatteryChange,
-                         base::Unretained(this));
-}
-
-BatteryStatusMessageFilter::~BatteryStatusMessageFilter() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  if (is_started_)
-    subscription_.reset();
-}
-
-bool BatteryStatusMessageFilter::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(BatteryStatusMessageFilter, message)
-    IPC_MESSAGE_HANDLER(BatteryStatusHostMsg_Start, OnBatteryStatusStart)
-    IPC_MESSAGE_HANDLER(BatteryStatusHostMsg_Stop, OnBatteryStatusStop)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void BatteryStatusMessageFilter::OnBatteryStatusStart() {
-  DCHECK(!is_started_);
-  if (is_started_)
-    return;
-  is_started_ = true;
-  subscription_ = BatteryStatusService::GetInstance()->AddCallback(callback_);
-}
-
-void BatteryStatusMessageFilter::OnBatteryStatusStop() {
-  DCHECK(is_started_);
-  if (!is_started_)
-    return;
-  is_started_ = false;
-  subscription_.reset();
-}
-
-void BatteryStatusMessageFilter::SendBatteryChange(
-    const blink::WebBatteryStatus& status) {
-  Send(new BatteryStatusMsg_DidChange(status));
-}
-
-}  // namespace content