Revert of Add OnDisplayMetricsChanged in DisplayObserver.

ash/display/screen_ash.cc

 // Copyright 2014 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 "ash/display/screen_ash.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/root_window_settings.h"
@@ skipping 170 matching lines @@
   return display_manager->GetDisplayAt(0).id() ==
       Shell::GetScreen()->GetPrimaryDisplay().id() ?
       display_manager->GetDisplayAt(1) : display_manager->GetDisplayAt(0);
 }
 
 // static
 const gfx::Display& ScreenAsh::GetDisplayForId(int64 display_id) {
   return GetDisplayManager()->GetDisplayForId(display_id);
 }
 
-void ScreenAsh::NotifyMetricsChanged(const gfx::Display& display,
-                                     uint32_t metrics) {
-  FOR_EACH_OBSERVER(gfx::DisplayObserver,
-                    observers_,
-                    OnDisplayMetricsChanged(display, metrics));
+void ScreenAsh::NotifyBoundsChanged(const gfx::Display& display) {
+  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
+                    OnDisplayBoundsChanged(display));
 }
 
 void ScreenAsh::NotifyDisplayAdded(const gfx::Display& display) {
   FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_, OnDisplayAdded(display));
 }
 
 void ScreenAsh::NotifyDisplayRemoved(const gfx::Display& display) {
   FOR_EACH_OBSERVER(
       gfx::DisplayObserver, observers_, OnDisplayRemoved(display));
 }
@@ skipping 75 matching lines @@
 
 void ScreenAsh::RemoveObserver(gfx::DisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 gfx::Screen* ScreenAsh::CloneForShutdown() {
   return new ScreenForShutdown(this);
 }
 
 }  // namespace ash