Make DesktopDragDropClientAuraX11 not depend on DesktopRootWindowHostX11.

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.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_drag_drop_client_aurax11.h"
 
 #include <X11/Xatom.h>
 
 #include "base/event_types.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/client/drag_drop_delegate.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 #include "ui/base/events/event.h"
 #include "ui/base/x/selection_utils.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/views/widget/desktop_aura/desktop_native_cursor_manager.h"
-#include "ui/views/widget/desktop_aura/desktop_root_window_host_x11.h"
 
 using aura::client::DragDropDelegate;
 using ui::OSExchangeData;
 
 namespace {
 
 const int kMinXdndVersion = 5;
 
 const int kWillAcceptDrop = 1;
 const int kWantFurtherPosEvents = 2;
@@ skipping 327 matching lines @@
   if (event->type == PropertyNotify &&
       event->xproperty.atom == atom_cache_->GetAtom("XdndActionList")) {
     ReadActions();
   }
   return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DesktopDragDropClientAuraX11::DesktopDragDropClientAuraX11(
-    views::DesktopRootWindowHostX11* root_window_host,
     aura::RootWindow* root_window,
     views::DesktopNativeCursorManager* cursor_manager,
     Display* xdisplay,
     ::Window xwindow)
     : move_loop_(this),
-      root_window_host_(root_window_host),
       root_window_(root_window),
       xdisplay_(xdisplay),
       xwindow_(xwindow),
       atom_cache_(xdisplay_, kAtomsToCache),
       target_window_(NULL),
       source_provider_(NULL),
       source_current_window_(None),
       drag_drop_in_progress_(false),
       drag_operation_(0),
       resulting_operation_(0),
@@ skipping 530 matching lines @@
   // GdkEvent about the failed drag. (And sending this message doesn't appear
   // to go through normal xlib machinery, but instead passes through the low
   // level xProto (the x11 wire format) that I don't understand.
   //
   // I'm unsure if I have to jump through those hoops, or if XSendEvent is
   // sufficient.
   XSendEvent(xdisplay_, xid, False, 0, xev);
 }
 
 }  // namespace views