Rename RootWindowHost to WindowTreeHost

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 
 #include <set>
 #include <X11/Xlib.h>
 
@@ skipping 24 matching lines @@
 class DropTargetEvent;
 class OSExchangeData;
 class OSExchangeDataProviderAuraX11;
 class SelectionFormatMap;
 }
 
 namespace views {
 class DesktopNativeCursorManager;
 
 // Implements drag and drop on X11 for aura. On one side, this class takes raw
-// X11 events forwarded from DesktopRootWindowHostLinux, while on the other, it
+// X11 events forwarded from DesktopWindowTreeHostLinux, while on the other, it
 // handles the views drag events.
 class VIEWS_EXPORT DesktopDragDropClientAuraX11
     : public aura::client::DragDropClient,
       public aura::WindowObserver,
       public X11WholeScreenMoveLoopDelegate {
  public:
   DesktopDragDropClientAuraX11(
       aura::Window* root_window,
       views::DesktopNativeCursorManager* cursor_manager,
       Display* xdisplay,
@@ skipping 158 matching lines @@
   gfx::NativeCursor grab_cursor_;
   gfx::NativeCursor copy_grab_cursor_;
   gfx::NativeCursor move_grab_cursor_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopDragDropClientAuraX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_