Use base::string16 for user-visible texts in ContentSuggestion

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>
 
 #include "base/macros.h"
+#include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "url/gurl.h"
 
 namespace ntp_snippets {
 
 // A content suggestion for the new tab page, which can be an article or an
 // offline page, for example.
 class ContentSuggestion {
  public:
   // Creates a new ContentSuggestion. The caller must ensure that the |id|
@@ skipping 11 matching lines @@
   // The normal content URL where the content referenced by the suggestion can
   // be accessed.
   const GURL& url() const { return url_; }
 
   // If available, this contains an URL to an AMP version of the same content.
   // Otherwise, this is an empty GURL().
   const GURL& amp_url() const { return amp_url_; }
   void set_amp_url(const GURL& amp_url) { amp_url_ = amp_url; }
 
   // Title of the suggestion.
-  const std::string& title() const { return title_; }
-  void set_title(const std::string& title) { title_ = title; }
+  const base::string16& title() const { return title_; }
+  void set_title(const base::string16& title) { title_ = title; }
 
   // Summary or relevant textual extract from the content.
-  const std::string& snippet_text() const { return snippet_text_; }
-  void set_snippet_text(const std::string& snippet_text) {
+  const base::string16& snippet_text() const { return snippet_text_; }
+  void set_snippet_text(const base::string16& snippet_text) {
     snippet_text_ = snippet_text;
   }
 
   // The time when the content represented by this suggestion was published.
   const base::Time& publish_date() const { return publish_date_; }
   void set_publish_date(const base::Time& publish_date) {
     publish_date_ = publish_date;
   }
 
   // The name of the source/publisher of this suggestion.
-  const std::string& publisher_name() const { return publisher_name_; }
-  void set_publisher_name(const std::string& publisher_name) {
+  const base::string16& publisher_name() const { return publisher_name_; }
+  void set_publisher_name(const base::string16& publisher_name) {
     publisher_name_ = publisher_name;
   }
 
   // TODO(pke): Remove the score from the ContentSuggestion class. The UI only
   // uses it to track user clicks (histogram data). Instead, the providers
   // should be informed about clicks and do appropriate logging themselves.
   // IMPORTANT: The score may simply be 0 for suggestions from providers which
   // 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_;
-  std::string title_;
-  std::string snippet_text_;
+  base::string16 title_;
+  base::string16 snippet_text_;
   GURL salient_image_url_;
   base::Time publish_date_;
-  std::string publisher_name_;
+  base::string16 publisher_name_;
   float score_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSuggestion);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTION_H_