Revert of Attempting to resolve a race condition with PowerMonitor

net/url_request/url_request_job.cc

Index: net/url_request/url_request_job.cc
diff --git a/net/url_request/url_request_job.cc b/net/url_request/url_request_job.cc
index 13326691f7238ffbc41bb5b0a7bc7cb315ab91fd..31a0d508e043eb0642936eeade8d7ad900d7407c 100644
--- a/net/url_request/url_request_job.cc
+++ b/net/url_request/url_request_job.cc
@@ -36,7 +36,9 @@
       deferred_redirect_status_code_(-1),
       network_delegate_(network_delegate),
       weak_factory_(this) {
-  base::PowerMonitor::AddObserver(this);
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->AddObserver(this);
 }
 
 void URLRequestJob::SetUpload(UploadDataStream* upload) {
@@ -244,7 +246,11 @@
 void URLRequestJob::NotifyURLRequestDestroyed() {
 }
 
-URLRequestJob::~URLRequestJob() { base::PowerMonitor::RemoveObserver(this); }
+URLRequestJob::~URLRequestJob() {
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->RemoveObserver(this);
+}
 
 void URLRequestJob::NotifyCertificateRequested(
     SSLCertRequestInfo* cert_request_info) {