Eliminate ash::internal namespace

ash/drag_drop/drag_drop_tracker.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 "ash/drag_drop/drag_drop_tracker.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/events/event.h"
 #include "ui/gfx/screen.h"
 #include "ui/wm/public/activation_delegate.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 // An activation delegate which disables activating the drag and drop window.
 class CaptureWindowActivationDelegate
     : public aura::client::ActivationDelegate {
  public:
   CaptureWindowActivationDelegate() {}
   virtual ~CaptureWindowActivationDelegate() {}
 
   // aura::client::ActivationDelegate overrides:
@@ skipping 64 matching lines @@
       ash::wm::GetRootWindowAt(location_in_screen),
       &target_root_location);
   return new ui::MouseEvent(event.type(),
                             target_location,
                             target_root_location,
                             event.flags(),
                             static_cast<const ui::MouseEvent&>(event).
                                 changed_button_flags());
 }
 
-}  // namespace internal
 }  // namespace ash