components: Use stl utilities from the base namespace

components/policy/core/common/schema.cc

Index: components/policy/core/common/schema.cc
diff --git a/components/policy/core/common/schema.cc b/components/policy/core/common/schema.cc
index 9af816ebafaa9d3b80c7aa9ee873f75d5cf1f782..f925e02da4b24bb0590715d1361c9779271ac851 100644
--- a/components/policy/core/common/schema.cc
+++ b/components/policy/core/common/schema.cc
@@ -488,7 +488,7 @@ bool Schema::InternalStorage::Parse(const base::DictionaryValue& schema,
   }
   std::string id_string;
   if (schema.GetString(schema::kId, &id_string)) {
-    if (ContainsKey(*id_map, id_string)) {
+    if (base::ContainsKey(*id_map, id_string)) {
       *error = "Duplicated id: " + id_string;
       return false;
     }