move favicon download code from chrome/ into content/

chrome/browser/favicon/favicon_util.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_UTIL_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_
 
 #include "ui/base/layout.h"
 
 class GURL;
@@ skipping 14 matching lines @@
 class FaviconUtil {
  public:
   // Returns the scale factors at which favicons should be fetched. This is
   // different from ui::GetSupportedScaleFactors() because clients which do
   // not support 1x should still fetch a favicon for 1x to push to sync. This
   // guarantees that the clients receiving sync updates pushed by this client
   // receive a favicon (potentially of the wrong scale factor) and do not show
   // the default favicon.
   static std::vector<ui::ScaleFactor> GetFaviconScaleFactors();
 
-  // Starts the download of the given favicon |url| from the given render view
-  // host. When the download is finished, an IconHostMsg_DidDownloadFavicon IPC
-  // message will be sent.
-  // Returns the unique id of the download request. The id will be sent in the
-  // IPC message.
-  static int DownloadFavicon(content::RenderViewHost* rvh,
-                             const GURL& url,
-                             int image_size);
-
   // Takes a vector of png-encoded frames, decodes them, and converts them to
   // a favicon of size favicon_size (in DIPs) at the desired ui scale factors.
   static gfx::Image SelectFaviconFramesFromPNGs(
       const std::vector<history::FaviconBitmapResult>& png_data,
       const std::vector<ui::ScaleFactor> scale_factors,
       int favicon_size);
 
   // Takes a vector of bitmaps and returns the index of the image that will best
   // produce an image of size |desired_size| for the given |scale_factors|.
   static size_t SelectBestFaviconFromBitmaps(
       const std::vector<SkBitmap>& bitmaps,
       const std::vector<ui::ScaleFactor>& scale_factors,
       int desired_size);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_