Remove ContentSuggestion::salient_image_url_.

components/ntp_snippets/content_suggestion.h

 // Copyright 2016 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_CONTENT_SUGGESTION_H_
 #define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTION_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 59 matching lines @@
   // cannot provide score values.
   float score() const { return score_; }
   void set_score(float score) { score_ = score; }
 
  private:
   std::string id_;
   GURL url_;
   GURL amp_url_;
   base::string16 title_;
   base::string16 snippet_text_;
-  GURL salient_image_url_;
   base::Time publish_date_;
   base::string16 publisher_name_;
   float score_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSuggestion);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTION_H_