Move chromeos specific utility functions for display to chromeos/display

ash/display/display_change_observer_x11.h

 // Copyright (c) 2012 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 ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_X11_H
 #define ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_X11_H
 
 #include <X11/Xlib.h>
 
 // Xlib.h defines RootWindow.
@@ skipping 10 matching lines @@
 // update DisplayManagers.
 class DisplayChangeObserverX11
     : public chromeos::OutputConfigurator::StateController,
       public chromeos::OutputConfigurator::Observer,
       public ShellObserver {
  public:
   DisplayChangeObserverX11();
   virtual ~DisplayChangeObserverX11();
 
   // chromeos::OutputConfigurator::StateController overrides:
-  virtual chromeos::OutputState GetStateForOutputs(
-      const chromeos::OutputSnapshotList& outputs) const OVERRIDE;
+  virtual chromeos::OutputState GetStateForDisplayIds(
+      const std::vector<int64>& outputs) const OVERRIDE;
 
   // Overriden from chromeos::OutputConfigurator::Observer:
   virtual void OnDisplayModeChanged() OVERRIDE;
 
   // Overriden from ShellObserver:
   virtual void OnAppTerminating() OVERRIDE;
 
  private:
   Display* xdisplay_;
 
   ::Window x_root_window_;
 
   int xrandr_event_base_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserverX11);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_AURA_DISPLAY_CHANGE_OBSERVER_X11_H