Don't use web intents for rss feeds.

chrome/browser/download/chrome_download_manager_delegate.cc

 // 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.
 
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 388 matching lines @@
   if ((item->GetWebContents() && !item->GetWebContents()->GetDelegate()) &&
       !web_intents::GetBrowserForBackgroundWebIntentDelivery(profile_)) {
     return false;
   }
   if (!item->GetForcedFilePath().empty())
     return false;
   if (item->GetTargetDisposition() == DownloadItem::TARGET_DISPOSITION_PROMPT)
     return false;
 
   std::string mime_type = item->GetMimeType();
-  if (mime_type == "application/rss+xml" ||
-      mime_type == "application/atom+xml") {
-    return true;
-  }
 
 #if defined(OS_CHROMEOS)
   if (mime_type == "application/msword" ||
       mime_type == "application/vnd.ms-powerpoint" ||
       mime_type == "application/vnd.ms-excel" ||
       mime_type == "application/vnd.openxmlformats-officedocument."
                    "wordprocessingml.document" ||
       mime_type == "application/vnd.openxmlformats-officedocument."
                    "presentationml.presentation" ||
       mime_type == "application/vnd.openxmlformats-officedocument."
@@ skipping 481 matching lines @@
     int32 download_id, int64 db_handle) {
   // It's not immediately obvious, but HistoryBackend::CreateDownload() can
   // call this function with an invalid |db_handle|. For instance, this can
   // happen when the history database is offline. We cannot have multiple
   // DownloadItems with the same invalid db_handle, so we need to assign a
   // unique |db_handle| here.
   if (db_handle == DownloadItem::kUninitializedHandle)
     db_handle = download_history_->GetNextFakeDbHandle();
   download_manager_->OnItemAddedToPersistentStore(download_id, db_handle);
 }