Add device policy to disallow shutdown - ash UI modifications

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 64 matching lines @@
   if (has_legacy_power_button_) {
     // If power button releases won't get reported correctly because we're not
     // running on official hardware, just lock the screen or shut down
     // immediately.
     if (down) {
       if (session_state_delegate->CanLockScreen() &&
           !session_state_delegate->IsScreenLocked() &&
           !controller_->LockRequested()) {
         controller_->StartLockAnimationAndLockImmediately(false);
       } else {
-        controller_->RequestShutdown(LockStateController::POWER_OFF);
+        controller_->RequestShutdown();
       }
     }
   } else {  // !has_legacy_power_button_
     if (down) {
       // If we already have a pending request to lock the screen, wait.
       if (controller_->LockRequested())
         return;
 
       if (session_state_delegate->CanLockScreen() &&
           !session_state_delegate->IsScreenLocked()) {
@@ skipping 57 matching lines @@
     } else if (state.display->current_mode()) {
       external_display_on = true;
     }
   }
   internal_display_off_and_external_display_on_ =
       internal_display_off && external_display_on;
 }
 #endif
 
 }  // namespace ash