Pass Physical Web metadata through a struct

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc

 // 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.
 
 #include "components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 135 matching lines @@
                                GetMostRecentPhysicalWebPagesWithFilter(
                                    kMaxSuggestionsCount,
                                    /*excluded_ids=*/std::set<std::string>()));
 }
 
 std::vector<ContentSuggestion>
 PhysicalWebPageSuggestionsProvider::GetMostRecentPhysicalWebPagesWithFilter(
     int max_quantity,
     const std::set<std::string>& excluded_ids) {
   std::unique_ptr<ListValue> page_values =
-      physical_web_data_source_->GetMetadata();
+      physical_web_data_source_->GetMetadataListValue();
 
   std::vector<const DictionaryValue*> page_dictionaries;
   for (const std::unique_ptr<Value>& page_value : *page_values) {
     const DictionaryValue* page_dictionary;
     if (!page_value->GetAsDictionary(&page_dictionary)) {
       LOG(DFATAL) << "Physical Web page is not a dictionary.";
       continue;
     }
     if (!excluded_ids.count(GetPageId(*page_dictionary))) {
       page_dictionaries.push_back(page_dictionary);
@@ skipping 66 matching lines @@
   FetchPhysicalWebPages();
 }
 
 void PhysicalWebPageSuggestionsProvider::OnDistanceChanged(
     const std::string& url,
     double distance_estimate) {
   FetchPhysicalWebPages();
 }
 
 }  // namespace ntp_snippets