Make DesktopDragDropClientAuraX11 not depend on DesktopRootWindowHostX11.

ui/views/widget/desktop_aura/desktop_root_window_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_root_window_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 928 matching lines @@
   aura::client::SetCursorClient(root_window_,
                                 cursor_client_.get());
 
   position_client_.reset(new DesktopScreenPositionClient);
   aura::client::SetScreenPositionClient(root_window_,
                                         position_client_.get());
 
   desktop_native_widget_aura_->InstallInputMethodEventFilter(root_window_);
 
   drag_drop_client_.reset(new DesktopDragDropClientAuraX11(
-      this, root_window_, desktop_native_cursor_manager, xdisplay_, xwindow_));
+      root_window_, desktop_native_cursor_manager, xdisplay_, xwindow_));
   aura::client::SetDragDropClient(root_window_, drag_drop_client_.get());
 
   // TODO(erg): Unify this code once the other consumer goes away.
   x11_window_event_filter_.reset(
       new X11WindowEventFilter(root_window_, activation_client_.get()));
   x11_window_event_filter_->SetUseHostWindowBorders(false);
   desktop_native_widget_aura_->root_window_event_filter()->AddHandler(
       x11_window_event_filter_.get());
 
   x11_window_move_client_.reset(new X11DesktopWindowMoveClient);
@@ skipping 390 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views