move favicon download code from chrome/ into content/

chrome/browser/favicon/favicon_download_helper_delegate.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 CHROME_BROWSER_FAVICON_FAVICON_DOWNLOAD_HELPER_DELEGATE_H_
-#define CHROME_BROWSER_FAVICON_FAVICON_DOWNLOAD_HELPER_DELEGATE_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-
-class GURL;
-class SkBitmap;
-struct FaviconURL;
-
-// This class provides a delegate interface for a FaviconDownloadHelper.  It
-// allows the FaviconDownloadHelper to pass favicon data back to its caller.
-class FaviconDownloadHelperDelegate {
- public:
-  // Called when the icon at |image_url| has been downloaded.
-  // |bitmaps| is a list of all the frames of the icon at |image_url|.
-  virtual void OnDidDownloadFavicon(
-      int id,
-      const GURL& image_url,
-      bool errored,
-      int requested_size,
-      const std::vector<SkBitmap>& bitmaps) {}
-
-  // Message Handler.
-  virtual void OnUpdateFaviconURL(
-      int32 page_id,
-      const std::vector<FaviconURL>& candidates) {}
-
- protected:
-  virtual ~FaviconDownloadHelperDelegate() {}
-};
-
-#endif  // CHROME_BROWSER_FAVICON_FAVICON_DOWNLOAD_HELPER_DELEGATE_H_