ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 2152 matching lines @@
       }
 
       // If we coalesced an event we need to free its cookie.
       if (num_coalesced > 0)
         XFreeEventData(xev->xgeneric.display, &last_event.xcookie);
       break;
     }
     case MapNotify: {
       window_mapped_ = true;
 
-      FOR_EACH_OBSERVER(DesktopWindowTreeHostObserverX11,
-                        observer_list_,
-                        OnWindowMapped(xwindow_));
+      for (DesktopWindowTreeHostObserverX11& observer : observer_list_)
+        observer.OnWindowMapped(xwindow_);
 
       UpdateMinAndMaxSize();
 
       // Some WMs only respect maximize hints after the window has been mapped.
       // Check whether we need to re-do a maximization.
       if (should_maximize_after_map_) {
         Maximize();
         should_maximize_after_map_ = false;
       }
 
       break;
     }
     case UnmapNotify: {
       window_mapped_ = false;
       wait_for_unmap_ = false;
       has_pointer_ = false;
       has_pointer_grab_ = false;
       has_pointer_focus_ = false;
       has_window_focus_ = false;
-      FOR_EACH_OBSERVER(DesktopWindowTreeHostObserverX11,
-                        observer_list_,
-                        OnWindowUnmapped(xwindow_));
+      for (DesktopWindowTreeHostObserverX11& observer : observer_list_)
+        observer.OnWindowUnmapped(xwindow_);
       break;
     }
     case ClientMessage: {
       Atom message_type = xev->xclient.message_type;
       if (message_type == atom_cache_.GetAtom("WM_PROTOCOLS")) {
         Atom protocol = static_cast<Atom>(xev->xclient.data.l[0]);
         if (protocol == atom_cache_.GetAtom("WM_DELETE_WINDOW")) {
           // We have received a close message from the window manager.
           OnHostCloseRequested();
         } else if (protocol == atom_cache_.GetAtom("_NET_WM_PING")) {
@@ skipping 161 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeThemeAura::instance();
 }
 
 }  // namespace views