Switch SupportsUserData uses to use unique_ptr.

components/offline_pages/content/suggested_articles_observer.h

 // Copyright 2017 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_OFFLINE_PAGES_CONTENT_SUGGESTED_ARTICLES_OBSERVER_H_
 #define COMPONENTS_OFFLINE_PAGES_CONTENT_SUGGESTED_ARTICLES_OBSERVER_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
 }
 
 namespace offline_pages {
 
 // Observes the ContentSuggestionsService, listening for new suggestions in the
 // ARTICLES category.  When those suggestions arrive, it then forwards them to
 // the Prefetch Service, which does not know about Content Suggestions
 // specifically.
 class SuggestedArticlesObserver
     : public ntp_snippets::ContentSuggestionsService::Observer,
-      base::SupportsUserData::Data {
+      public base::SupportsUserData::Data {
  public:
   // Delegate exists to allow for dependency injection in unit tests.
   // SuggestedArticlesObserver implements its own delegate, |DefaultDelegate| in
   // the .cc file that forwards to the ContentSuggestionsService and the
   // PrefetchServiceFactory.  Code inside |DefaultDelegate| should be as simple
   // as possible, since it will only be covered by instrumentation/browser
   // tests.
   class Delegate {
    public:
     virtual const std::vector<ntp_snippets::ContentSuggestion>& GetSuggestions(
@@ skipping 29 matching lines @@
   ntp_snippets::CategoryStatus category_status_ =
       ntp_snippets::CategoryStatus::INITIALIZING;
   std::unique_ptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestedArticlesObserver);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CONTENT_SUGGESTED_ARTICLES_OBSERVER_H_