Make the id used in IconMsg_DownloadFavicon unique

chrome/browser/favicon/favicon_handler.cc

Index: chrome/browser/favicon/favicon_handler.cc
diff --git a/chrome/browser/favicon/favicon_handler.cc b/chrome/browser/favicon/favicon_handler.cc
index 8aef33a71e25eb52812dfa659980407835ba0417..41d388c6c8417b5554ef712635583daf6d25cbd0 100644
--- a/chrome/browser/favicon/favicon_handler.cc
+++ b/chrome/browser/favicon/favicon_handler.cc
@@ -346,9 +346,7 @@ int FaviconHandler::DownloadFavicon(const GURL& image_url, int image_size) {
     NOTREACHED();
     return 0;
   }
-  static int next_id = 1;
-  int id = next_id++;
-  delegate_->StartDownload(id, image_url, image_size);
+  int id = delegate_->StartDownload(image_url, image_size);
   return id;
 }