Revert of Add OnDisplayMetricsChanged in DisplayObserver.

ash/touch/touch_hud_debug.h

 // Copyright 2013 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_TOUCH_TOUCH_HUD_DEBUG_H_
 #define ASH_TOUCH_TOUCH_HUD_DEBUG_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 42 matching lines @@
 
  private:
   virtual ~TouchHudDebug();
 
   void SetMode(Mode mode);
 
   void UpdateTouchPointLabel(int index);
 
   // Overriden from TouchObserverHUD.
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
-  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
-                                       uint32_t metrics) OVERRIDE;
+  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
   virtual void SetHudForRootWindowController(
       RootWindowController* controller) OVERRIDE;
   virtual void UnsetHudForRootWindowController(
       RootWindowController* controller) OVERRIDE;
 
   static const int kMaxTouchPoints = 32;
 
   Mode mode_;
 
   scoped_ptr<TouchLog> touch_log_;
 
   TouchHudCanvas* canvas_;
   views::View* label_container_;
   views::Label* touch_labels_[kMaxTouchPoints];
 
   DISALLOW_COPY_AND_ASSIGN(TouchHudDebug);
 };
 
 }  // namespace ash
 
 #endif  // ASH_TOUCH_TOUCH_HUD_DEBUG_H_