Make SystemMonitor not a Singleton and move it out of base

views/widget/widget_win.h

 // Copyright (c) 2009 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 VIEWS_WIDGET_WIDGET_WIN_H_
 #define VIEWS_WIDGET_WIDGET_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
 #include <atlmisc.h>
 
 #include "app/win/window_impl.h"
 #include "base/message_loop.h"
 #include "base/scoped_comptr_win.h"
-#include "base/system_monitor.h"
 #include "views/focus/focus_manager.h"
 #include "views/layout_manager.h"
 #include "views/widget/widget.h"
 
 namespace gfx {
 class Canvas;
 class Rect;
 }
 
 namespace views {
@@ skipping 510 matching lines @@
 
   // Instance of accessibility information and handling for MSAA root
   ScopedComPtr<IAccessible> accessibility_root_;
 
   scoped_ptr<DefaultThemeProvider> default_theme_provider_;
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_WIDGET_WIN_H_