Get drag and drop working for win aura.

ash/screensaver/screensaver_view.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/screensaver/screensaver_view.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
 #include "ui/aura/root_window.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/controls/webview/webview.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/widget/widget.h"
 
 using content::BrowserThread;
 
 namespace {
 
@@ skipping 122 matching lines @@
   container_window_->Show();
 }
 
 // static
 ScreensaverView* ScreensaverView::GetInstance() {
   return g_instance;
 }
 
 }  // namespace internal
 }  // namespace ash