chrome: Use stl utilities from the base namespace

chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc

Index: chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
diff --git a/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc b/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
index ea0efa28637797ba1fe927374a554be60eac2873..b2452fbfac5191e89e8b9b78a188c6472e14faff 100644
--- a/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
+++ b/chrome/browser/ui/app_list/arc/arc_package_syncable_service.cc
@@ -134,7 +134,7 @@ syncer::SyncMergeResult ArcPackageSyncableService::MergeDataAndStartSyncing(
     std::unique_ptr<ArcSyncItem> sync_item(
         CreateSyncItemFromSyncData(sync_data));
     const std::string& package_name = sync_item->package_name;
-    if (!ContainsKey(local_package_set, package_name)) {
+    if (!base::ContainsKey(local_package_set, package_name)) {
       pending_install_items_[package_name] = std::move(sync_item);
       InstallPackage(pending_install_items_[package_name].get());
     } else {
@@ -146,7 +146,7 @@ syncer::SyncMergeResult ArcPackageSyncableService::MergeDataAndStartSyncing(
   // Creates sync items for local unsynced packages.
   syncer::SyncChangeList change_list;
   for (const auto& local_package_name : local_packages) {
-    if (ContainsKey(sync_items_, local_package_name))
+    if (base::ContainsKey(sync_items_, local_package_name))
       continue;
 
     if (!ShouldSyncPackage(local_package_name))