Move SystemMonitor to src/chrome/common....

ui/base/system_monitor/system_monitor.cc

Index: ui/base/system_monitor/system_monitor.cc
===================================================================
--- ui/base/system_monitor/system_monitor.cc	(revision 0)
+++ ui/base/system_monitor/system_monitor.cc	(working copy)
@@ -1,13 +1,15 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 "app/system_monitor.h"
+#include "ui/base/system_monitor/system_monitor.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 
+namespace ui {
+
 static SystemMonitor* g_system_monitor = NULL;
 
 #if defined(ENABLE_BATTERY_MONITORING)
@@ -102,3 +104,5 @@
 void SystemMonitor::BatteryCheck() {
   ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
 }
+
+}  // namespace ui