x11: Simplify some more event-rewrite code.

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 1502 matching lines @@
       } else if (message_type == atom_cache_.GetAtom("XdndDrop")) {
         drag_drop_client_->OnXdndDrop(xev->xclient);
       }
       break;
     }
     case MappingNotify: {
       switch (xev->xmapping.request) {
         case MappingModifier:
         case MappingKeyboard:
           XRefreshKeyboardMapping(&xev->xmapping);
-          OnKeyboardMappingChanged();
           break;
         case MappingPointer:
           ui::DeviceDataManager::GetInstance()->UpdateButtonMap();
           break;
         default:
           NOTIMPLEMENTED() << " Unknown request: " << xev->xmapping.request;
           break;
       }
       break;
     }
@@ skipping 94 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views