diff -up chromium-126.0.6478.26/components/visited_url_ranking/internal/visited_url_ranking_service_impl.cc.std_variant chromium-126.0.6478.26/components/visited_url_ranking/internal/visited_url_ranking_service_impl.cc
--- chromium-126.0.6478.26/components/visited_url_ranking/internal/visited_url_ranking_service_impl.cc.std_variant	2024-06-04 12:31:10.602282813 +0200
+++ chromium-126.0.6478.26/components/visited_url_ranking/internal/visited_url_ranking_service_impl.cc	2024-06-04 13:21:50.121345183 +0200
@@ -7,7 +7,6 @@
 #include <map>
 #include <memory>
 #include <queue>
-#include <variant>
 #include <vector>
 
 #include "base/barrier_callback.h"
@@ -41,20 +40,16 @@ std::vector<URLVisitAggregate> ComputeUR
     for (std::pair<const URLMergeKey, URLVisitAggregate::URLVisitVariant>&
              url_data : result.data) {
       URLVisitAggregate& aggregate = url_visit_map[url_data.first];
-      std::visit(
-          URLVisitVariantHelper{
-              [&aggregate](URLVisitAggregate::TabData& tab_data) {
-                aggregate.fetcher_data_map.emplace(
-                    tab_data.last_active_tab.session_name.has_value()
-                        ? Fetcher::kSession
-                        : Fetcher::kTabModel,
-                    std::move(tab_data));
-              },
-              [&aggregate](URLVisitAggregate::HistoryData& history_data) {
-                aggregate.fetcher_data_map.emplace(Fetcher::kHistory,
-                                                   std::move(history_data));
-              }},
-          url_data.second);
+      if (std::holds_alternative<URLVisitAggregate::TabData>(url_data.second)) {
+        auto& tab_data = std::get<URLVisitAggregate::TabData>(url_data.second);
+        aggregate.fetcher_data_map.emplace(
+            tab_data.last_active_tab.session_name.has_value()
+                ? Fetcher::kSession
+                : Fetcher::kTabModel,
+            std::move(tab_data));
+      }
+      // TODO(crbug.com/330580109): Add support for history fetcher and
+      // associated aggregate data type.
     }
   }
 
diff -up chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.cc.std_variant chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.cc
--- chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.cc.std_variant	2024-06-04 12:29:20.593240495 +0200
+++ chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.cc	2024-06-04 12:29:57.253921979 +0200
@@ -37,14 +37,12 @@ URLVisitAggregate& URLVisitAggregate::op
 std::set<const GURL*> URLVisitAggregate::GetAssociatedURLs() const {
   std::set<const GURL*> urls = {};
   for (const auto& fetcher_entry : fetcher_data_map) {
-    std::visit(URLVisitVariantHelper{
-                   [&urls](const URLVisitAggregate::TabData& tab_data) {
-                     urls.insert(&tab_data.last_active_tab.visit.url);
-                   },
-                   [&urls](const URLVisitAggregate::HistoryData& history_data) {
-                     urls.insert(&history_data.last_visited.url_row.url());
-                   }},
-               fetcher_entry.second);
+    if (std::holds_alternative<URLVisitAggregate::TabData>(
+            fetcher_entry.second)) {
+      const auto& tab_data =
+          std::get<URLVisitAggregate::TabData>(fetcher_entry.second);
+      urls.insert(&tab_data.last_active_tab.visit.url);
+    }
   }
   return urls;
 }
diff -up chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.h.std_variant chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.h
--- chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.h.std_variant	2024-06-04 11:05:39.505847241 +0200
+++ chromium-126.0.6478.26/components/visited_url_ranking/public/url_visit.h	2024-06-04 13:22:26.518007748 +0200
@@ -8,6 +8,7 @@
 #include <memory>
 #include <optional>
 #include <set>
+#include <variant>
 #include <vector>
 
 #include "base/functional/callback.h"
@@ -140,18 +141,6 @@ struct URLVisitAggregate {
   bool bookmarked = false;
 };
 
-// Helper to visit each variant of URLVisitVariant.
-// Usage:
-//   std::visit(URLVisitVariantHelper{
-//         [](Variant1& variant1) {},
-//         [](Variant2& variant1) {},
-//         [](Variant3& variant1) {},
-//      variant_data);
-template <class... Ts>
-struct URLVisitVariantHelper : Ts... {
-  using Ts::operator()...;
-};
-
 }  // namespace visited_url_ranking
 
 #endif  // COMPONENTS_VISITED_URL_RANKING_PUBLIC_URL_VISIT_H_