Convert string16 to base::string16 in content.

content/browser/web_contents/web_drag_source_gtk.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "base/basictypes.h"
@@ skipping 74 matching lines @@
   // renderer widget, we can persist drags even when our contents is switched
   // out. We can't use an OwnedWidgetGtk because the GtkInvisible widget
   // initialization code sinks the reference.
   GtkWidget* drag_widget_;
 
   // Context created once drag starts.  A NULL value indicates that there is
   // no drag currently in progress.
   GdkDragContext* drag_context_;
 
   // The file mime type for a drag-out download.
-  string16 wide_download_mime_type_;
+  base::string16 wide_download_mime_type_;
 
   // The file name to be saved to for a drag-out download.
   base::FilePath download_file_name_;
 
   // The URL to download from for a drag-out download.
   GURL download_url_;
 
   // The widget that provides visual feedback for the drag. We can't use
   // an OwnedWidgetGtk because the GtkWindow initialization code sinks
   // the reference.
   GtkWidget* drag_icon_;
 
   ui::GtkSignalRegistrar signals_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragSourceGtk);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_