SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

net/url_request/url_request_job.cc

 // 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.
 
 #include "net/url_request/url_request_job.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "base/power_monitor/power_monitor.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "net/base/auth.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_states.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_delegate.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
 
 URLRequestJob::URLRequestJob(URLRequest* request,
                              NetworkDelegate* network_delegate)
     : request_(request),
       done_(false),
       prefilter_bytes_read_(0),
       postfilter_bytes_read_(0),
       filter_input_byte_count_(0),
       filter_needs_more_output_space_(false),
       filtered_read_buffer_len_(0),
       has_handled_response_(false),
       expected_content_size_(-1),
       deferred_redirect_status_code_(-1),
       network_delegate_(network_delegate),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
-  base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
-  if (system_monitor)
-    base::SystemMonitor::Get()->AddPowerObserver(this);
+  base::PowerMonitor::GetInstance()->AddObserver(this);
 }
 
 void URLRequestJob::SetUpload(UploadData* upload) {
 }
 
 void URLRequestJob::SetExtraRequestHeaders(const HttpRequestHeaders& headers) {
 }
 
 void URLRequestJob::Kill() {
   weak_factory_.InvalidateWeakPtrs();
@@ skipping 163 matching lines @@
 }
 
 void URLRequestJob::OnSuspend() {
   Kill();
 }
 
 void URLRequestJob::NotifyURLRequestDestroyed() {
 }
 
 URLRequestJob::~URLRequestJob() {
-  base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
-  if (system_monitor)
-    base::SystemMonitor::Get()->RemovePowerObserver(this);
+  base::PowerMonitor::GetInstance()->RemoveObserver(this);
 }
 
 void URLRequestJob::NotifyCertificateRequested(
     SSLCertRequestInfo* cert_request_info) {
   if (!request_)
     return;  // The request was destroyed, so there is no more work to do.
 
   request_->NotifyCertificateRequested(cert_request_info);
 }
 
@@ skipping 463 matching lines @@
 }
 
 bool URLRequestJob::FilterHasData() {
     return filter_.get() && filter_->stream_data_len();
 }
 
 void URLRequestJob::UpdatePacketReadTimes() {
 }
 
 }  // namespace net