content: Use base::MessageLoop.

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 12 matching lines @@
 class SkBitmap;
 struct WebDropData;
 
 namespace content {
 
 class RenderViewHostImpl;
 class WebContentsImpl;
 
 // WebDragSourceGtk takes care of managing the drag from a WebContents
 // with Gtk.
-class CONTENT_EXPORT WebDragSourceGtk : public MessageLoopForUI::Observer {
+class CONTENT_EXPORT WebDragSourceGtk :
+    public base::MessageLoopForUI::Observer {
  public:
   explicit WebDragSourceGtk(WebContents* web_contents);
   virtual ~WebDragSourceGtk();
 
   // Starts a drag for the WebContents this WebDragSourceGtk was created for.
   // Returns false if the drag could not be started.
   bool StartDragging(const WebDropData& drop_data,
                      WebKit::WebDragOperationsMask allowed_ops,
                      GdkEventButton* last_mouse_down,
                      const SkBitmap& image,
@@ skipping 61 matching lines @@
   GtkWidget* drag_icon_;
 
   ui::GtkSignalRegistrar signals_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragSourceGtk);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_GTK_H_