Allow closing root window, or pressing the power button to shutdown ash_shell, and chrome /w chrome…

ui/aura/root_window_host_linux.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 "ui/aura/root_window_host_linux.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xcursor/Xcursor.h>
 #include <X11/Xlib.h>
 #include <X11/cursorfont.h>
@@ skipping 696 matching lines @@
       // If there's no window manager running, we need to assign the X input
       // focus to our host window.
       if (!IsWindowManagerPresent() && focus_when_shown_)
         XSetInputFocus(xdisplay_, xwindow_, RevertToNone, CurrentTime);
       break;
     }
     case ClientMessage: {
       Atom message_type = static_cast<Atom>(xev->xclient.data.l[0]);
       if (message_type == atom_cache_.GetAtom("WM_DELETE_WINDOW")) {
         // We have received a close message from the window manager.
-        delegate_->AsRootWindow()->OnRootWindowHostClosed();
+        delegate_->AsRootWindow()->OnRootWindowHostCloseRequested();
       } else if (message_type == atom_cache_.GetAtom("_NET_WM_PING")) {
         XEvent reply_event = *xev;
         reply_event.xclient.window = x_root_window_;
 
         XSendEvent(xdisplay_,
                    reply_event.xclient.window,
                    False,
                    SubstructureRedirectMask | SubstructureNotifyMask,
                    &reply_event);
       }
@@ skipping 326 matching lines @@
       ui::ViewProp::GetValue(accelerated_widget, kRootWindowHostLinuxKey));
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpAuraX11::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura