Removes specifying transient at the aura level for top levels

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 221 matching lines @@
 void DesktopWindowTreeHostX11::OnRootWindowCreated(
     aura::WindowEventDispatcher* dispatcher,
     const Widget::InitParams& params) {
   dispatcher_ = dispatcher;
 
   dispatcher_->window()->SetProperty(kViewsWindowForRootWindow,
                                      content_window_);
   dispatcher_->window()->SetProperty(kHostForRootWindow, this);
   delegate_ = dispatcher_;
 
-  // If we're given a parent, we need to mark ourselves as transient to another
-  // window. Otherwise activation gets screwy.
-  gfx::NativeView parent = params.parent;
-  if (!params.child && params.parent) {
-    corewm::AddTransientChild(parent, content_window_);
-  }
-
   // Ensure that the X11DesktopHandler exists so that it dispatches activation
   // messages to us.
   X11DesktopHandler::get();
 
   // TODO(erg): Unify this code once the other consumer goes away.
   x11_window_event_filter_.reset(new X11WindowEventFilter(dispatcher_, this));
   SetUseNativeFrame(params.type == Widget::InitParams::TYPE_WINDOW &&
                     !params.remove_standard_frame);
   desktop_native_widget_aura_->root_window_event_filter()->AddHandler(
       x11_window_event_filter_.get());
@@ skipping 1369 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views