Ntp: use AMP urls for content suggestions when available.

components/ntp_snippets/remote/ntp_snippet.h

 // Copyright 2015 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 COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPET_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPET_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 110 matching lines @@
 
   // base::MakeUnique doesn't work if the ctor is private.
   static std::unique_ptr<NTPSnippet> MakeUnique(
       const std::vector<std::string>& ids, int remote_category_id);
 
   // The first ID in the vector is the primary id.
   std::vector<std::string> ids_;
   std::string title_;
   GURL url_;
   std::string publisher_name_;
+
+  // TODO(mvanouwerkerk): Remove this field and its uses, just use |url_|.
   GURL amp_url_;
+
   GURL salient_image_url_;
   std::string snippet_;
   base::Time publish_date_;
   base::Time expiry_date_;
   float score_;
   bool is_dismissed_;
   int remote_category_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippet);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPET_H_