Remove DisplayState from the public interface for DisplayConfigurator

ash/wm/power_button_controller.cc

 // 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.
 
 #include "ash/wm/power_button_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 127 matching lines @@
     volume_down_pressed_ = event->type() == ui::ET_KEY_PRESSED ||
                            event->type() == ui::ET_TRANSLATED_KEY_PRESS;
   }
 }
 
 #if defined(OS_CHROMEOS)
 void PowerButtonController::OnDisplayModeChanged(
     const ui::DisplayConfigurator::DisplayStateList& display_states) {
   bool internal_display_off = false;
   bool external_display_on = false;
-  for (size_t i = 0; i < display_states.size(); ++i) {
-    const ui::DisplayConfigurator::DisplayState& state = display_states[i];
-    if (state.display->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
-      if (!state.display->current_mode())
+  for (const ui::DisplaySnapshot* display : display_states) {
+    if (display->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
+      if (!display->current_mode())
         internal_display_off = true;
-    } else if (state.display->current_mode()) {
+    } else if (display->current_mode()) {
       external_display_on = true;
     }
   }
   internal_display_off_and_external_display_on_ =
       internal_display_off && external_display_on;
 }
 #endif
 
 }  // namespace ash