[Aura] Fix window resize handling on fullscreen event

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 687 matching lines @@
   // Replace the frame and layout the contents. Even though we don't have a
   // swapable glass frame like on Windows, we still replace the frame because
   // the button assets don't update otherwise.
   native_widget_delegate_->AsWidget()->non_client_view()->UpdateFrame();
 }
 
 void DesktopWindowTreeHostX11::SetFullscreen(bool fullscreen) {
   if (is_fullscreen_ == fullscreen)
     return;
   is_fullscreen_ = fullscreen;
+  if (is_fullscreen_)
+    delayed_resize_task_.Cancel();
 
   // Work around a bug where if we try to unfullscreen, metacity immediately
   // fullscreens us again. This is a little flickery and not necessary if
   // there's a gnome-panel, but it's not easy to detect whether there's a
   // panel or not.
   bool unmaximize_and_remaximize = !fullscreen && IsMaximized() &&
                                    ui::GuessWindowManager() == ui::WM_METACITY;
 
   if (unmaximize_and_remaximize)
     Restore();
@@ skipping 1196 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views