Revert "Tweak the WebDragDestDelegate to be useful for more than GTK."

content/browser/tab_contents/web_drag_dest_delegate.h

-// Copyright (c) 2011 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_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_H_
-#define CONTENT_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_H_
-#pragma once
-
-#if defined(TOOLKIT_GTK)
-#include <gtk/gtk.h>
-#endif  // TOOLKIT_GTK
-
-#include "base/string16.h"
-#include "content/common/content_export.h"
-
-class GURL;
-class TabContents;
-
-namespace content {
-
-// An optional delegate that listens for drags of bookmark data.
-class CONTENT_EXPORT WebDragDestDelegate {
- public:
-  // Announces that a drag has started. It's valid that a drag starts, along
-  // with over/enter/leave/drop notifications without receiving any bookmark
-  // data.
-  virtual void DragInitialize(TabContents* contents) = 0;
-
-  // Notifications of drag progression.
-  virtual void OnDragOver() = 0;
-  virtual void OnDragEnter() = 0;
-  virtual void OnDrop() = 0;
-
-#if defined(TOOLKIT_GTK)
-  // Returns the bookmark atom type. GTK and Views return different values here.
-  virtual GdkAtom GetBookmarkTargetAtom() const = 0;
-
-  // Called when WebDragDestkGtk detects that there's bookmark data in a
-  // drag. Not every drag will trigger these.
-  virtual void OnReceiveDataFromGtk(GtkSelectionData* data) = 0;
-  virtual void OnReceiveProcessedData(const GURL& url,
-                                      const string16& title) = 0;
-#endif  // TOOLKIT_GTK
-
-  // This should also clear any state kept about this drag.
-  virtual void OnDragLeave() = 0;
-
-  virtual ~WebDragDestDelegate() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_H_