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

net/http/http_network_layer.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_LAYER_H_
 #define NET_HTTP_HTTP_NETWORK_LAYER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/system_monitor/system_monitor.h"
+#include "base/power_monitor/power_observer.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/base/net_export.h"
 #include "net/http/http_transaction_factory.h"
 
 namespace net {
 
 class HttpNetworkSession;
 
 class NET_EXPORT HttpNetworkLayer
     : public HttpTransactionFactory,
-      public base::SystemMonitor::PowerObserver,
+      public base::PowerObserver,
       NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   // Construct a HttpNetworkLayer with an existing HttpNetworkSession which
   // contains a valid ProxyService.
   explicit HttpNetworkLayer(HttpNetworkSession* session);
   virtual ~HttpNetworkLayer();
 
   // Create a transaction factory that instantiate a network layer over an
   // existing network session. Network session contains some valuable
   // information (e.g. authentication data) that we want to share across
   // multiple network layers. This method exposes the implementation details
   // of a network layer, use this method with an existing network layer only
   // when network session is shared.
   static HttpTransactionFactory* CreateFactory(HttpNetworkSession* session);
 
   // Forces an alternate protocol of SPDY/2 on port 443.
   // TODO(rch): eliminate this method.
   static void ForceAlternateProtocol();
 
   // HttpTransactionFactory methods:
   virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans,
                                 HttpTransactionDelegate* delegate) OVERRIDE;
   virtual HttpCache* GetCache() OVERRIDE;
   virtual HttpNetworkSession* GetSession() OVERRIDE;
 
-  // base::SystemMonitor::PowerObserver methods:
+  // base::PowerObserver methods:
   virtual void OnSuspend() OVERRIDE;
   virtual void OnResume() OVERRIDE;
 
  private:
   const scoped_refptr<HttpNetworkSession> session_;
   bool suspended_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_LAYER_H_