Don't use web intents for rss feeds.

net/base/mime_util.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 <map>
 #include <string>
 
 #include "net/base/mime_util.h"
 #include "net/base/platform_mime_util.h"
 
@@ skipping 315 matching lines @@
   // Many users complained about css files served for
   // download instead of displaying in the browser:
   // http://code.google.com/p/chromium/issues/detail?id=7192
   // So, by including "text/css" into this list we choose Firefox
   // behavior - css files will be displayed:
   "text/css",
   "text/vnd.chromium.ftp-dir",
   "text/",
   "image/svg+xml",  // SVG is text-based XML, even though it has an image/ type
   "application/xml",
+  "application/atom+xml",
+  "application/rss+xml",
   "application/xhtml+xml",
   "application/json",
   "application/x-x509-user-cert",
   "multipart/related",  // For MHTML support.
   "multipart/x-mixed-replace"
   // Note: ADDING a new type here will probably render it AS HTML. This can
   // result in cross site scripting.
 };
 
 // These types are excluded from the logic that allows all text/ types because
@@ skipping 568 matching lines @@
 const std::string GetIANAMediaType(const std::string& mime_type) {
   for (size_t i = 0; i < arraysize(kIanaMediaTypes); ++i) {
     if (StartsWithASCII(mime_type, kIanaMediaTypes[i].matcher, true)) {
       return kIanaMediaTypes[i].name;
     }
   }
   return "";
 }
 
 }  // namespace net