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

ui/base/system_monitor/system_monitor_mac.mm

-// 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"
 
 #import <AppKit/AppKit.h>
 
+namespace ui {
+
 @interface SystemMonitorBridge : NSObject {
  @private
   SystemMonitor* systemMonitor_;  // weak
 }
 
 - (id)initWithSystemMonitor:(SystemMonitor*)monitor;
 - (void)computerDidSleep:(NSNotification*)notification;
 - (void)computerDidWake:(NSNotification*)notification;
 
 @end
@@ skipping 39 matching lines @@
 @end
 
 void SystemMonitor::PlatformInit() {
   system_monitor_bridge_ =
       [[SystemMonitorBridge alloc] initWithSystemMonitor:this];
 }
 
 void SystemMonitor::PlatformDestroy() {
   [system_monitor_bridge_ release];
 }
+
+}  // namespace ui