Replace most LOG statements with DLOG statements in base.

base/system_monitor/system_monitor_win.cc

 // Copyright (c) 2011 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 "base/system_monitor/system_monitor.h"
 
 namespace base {
 
 void SystemMonitor::ProcessWmPowerBroadcastMessage(int event_id) {
   PowerEvent power_event;
@@ skipping 23 matching lines @@
     // PBT_POWERSETTINGCHANGE - user changed the power settings.
   }
   ProcessPowerMessage(power_event);
 }
 
 // Function to query the system to see if it is currently running on
 // battery power.  Returns true if running on battery.
 bool SystemMonitor::IsBatteryPower() {
   SYSTEM_POWER_STATUS status;
   if (!GetSystemPowerStatus(&status)) {
-    LOG(ERROR) << "GetSystemPowerStatus failed: " << GetLastError();
+    DLOG(ERROR) << "GetSystemPowerStatus failed: " << GetLastError();
     return false;
   }
   return (status.ACLineStatus == 0);
 }
 
 }  // namespace base