Move DisplayUtils methods into gfx::Screen.

ui/aura/screen_aura.h

 // 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.
 
 #ifndef UI_AURA_SCREEN_AURA_H_
 #define UI_AURA_SCREEN_AURA_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/aura/aura_export.h"
@@ skipping 17 matching lines @@
   virtual gfx::Point GetCursorScreenPointImpl() OVERRIDE;
   virtual gfx::Rect GetMonitorWorkAreaNearestWindowImpl(
       gfx::NativeView view) OVERRIDE;
   virtual gfx::Rect GetMonitorAreaNearestWindowImpl(
       gfx::NativeView view) OVERRIDE;
   virtual gfx::Rect GetMonitorWorkAreaNearestPointImpl(
       const gfx::Point& point) OVERRIDE;
   virtual gfx::Rect GetMonitorAreaNearestPointImpl(
       const gfx::Point& point) OVERRIDE;
   virtual gfx::NativeWindow GetWindowAtCursorScreenPointImpl() OVERRIDE;
+  virtual gfx::Size GetPrimaryMonitorSizeImpl() OVERRIDE;
+  virtual int GetNumMonitorsImpl() OVERRIDE;
 
  private:
   // We currently support only one monitor. These two methods return the bounds
   // and work area.
   gfx::Rect GetBounds();
   gfx::Rect GetWorkAreaBounds();
 
   // Insets for the work area.
   gfx::Insets work_area_insets_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenAura);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_SCREEN_AURA_H_