Revert of Attempting to resolve a race condition with PowerMonitor

net/http/http_network_layer.cc

Index: net/http/http_network_layer.cc
diff --git a/net/http/http_network_layer.cc b/net/http/http_network_layer.cc
index 9d6dc041bc5329adac273291da329c6a413f318c..0704de420de32d29349e8e6d50f311387a362db3 100644
--- a/net/http/http_network_layer.cc
+++ b/net/http/http_network_layer.cc
@@ -25,13 +25,17 @@
       suspended_(false) {
   DCHECK(session_.get());
 #if defined(OS_WIN)
-  base::PowerMonitor::AddObserver(this);
+ base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+ if (power_monitor)
+   power_monitor->AddObserver(this);
 #endif
 }
 
 HttpNetworkLayer::~HttpNetworkLayer() {
 #if defined(OS_WIN)
-  base::PowerMonitor::RemoveObserver(this);
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->RemoveObserver(this);
 #endif
 }