Switch SupportsUserData uses to use unique_ptr.

components/offline_pages/content/suggested_articles_observer.cc

 // 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.
 
 #include "components/offline_pages/content/suggested_articles_observer.h"
 
 #include <unordered_set>
 
 #include "base/memory/ptr_util.h"
 #include "components/ntp_snippets/category.h"
@@ skipping 58 matching lines @@
 // static
 void SuggestedArticlesObserver::ObserveContentSuggestionsService(
     content::BrowserContext* browser_context,
     ntp_snippets::ContentSuggestionsService* service) {
   if (!offline_pages::IsPrefetchingOfflinePagesEnabled())
     return;
 
   auto suggestions_observer = base::MakeUnique<SuggestedArticlesObserver>(
       browser_context, base::MakeUnique<DefaultDelegate>(service));
   service->AddObserver(suggestions_observer.get());
-  service->SetUserData(
-      &kOfflinePageSuggestedArticlesObserverUserDataKey,
-      // Note that |service| will take ownership of suggestions_observer
-      // despite accepting a raw pointer.
-      suggestions_observer.release());
+  service->SetUserData(&kOfflinePageSuggestedArticlesObserverUserDataKey,
+                       std::move(suggestions_observer));
 }
 
 SuggestedArticlesObserver::SuggestedArticlesObserver(
     content::BrowserContext* browser_context,
     std::unique_ptr<Delegate> delegate)
     : browser_context_(browser_context), delegate_(std::move(delegate)) {}
 
 SuggestedArticlesObserver::~SuggestedArticlesObserver() = default;
 
 void SuggestedArticlesObserver::OnNewSuggestions(Category category) {
@@ skipping 67 matching lines @@
   }
   service->RemoveAllUnprocessedPrefetchURLs(kSuggestedArticlesNamespace);
   OnNewSuggestions(ArticlesCategory());
 }
 
 void SuggestedArticlesObserver::ContentSuggestionsServiceShutdown() {
   // No need to do anything here, we will just stop getting events.
 }
 
 }  // namespace offline_pages