Migrate desktop_photo_search to top level (#1002)

desktop_photo_search/fluent_ui/lib/src/unsplash/links.dart

@@ -0,0 +1,41 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+
+import 'package:built_value/built_value.dart';
+import 'package:built_value/serializer.dart';
+
+import '../serializers.dart';
+
+part 'links.g.dart';
+
+abstract class Links implements Built<Links, LinksBuilder> {
+  factory Links([void Function(LinksBuilder)? updates]) = _$Links;
+
+  Links._();
+
+  @BuiltValueField(wireName: 'self')
+  String? get self;
+
+  @BuiltValueField(wireName: 'html')
+  String? get html;
+
+  @BuiltValueField(wireName: 'download')
+  String? get download;
+
+  @BuiltValueField(wireName: 'download_location')
+  String? get downloadLocation;
+
+  String toJson() {
+    return json.encode(serializers.serializeWith(Links.serializer, this));
+  }
+
+  static Links? fromJson(String jsonString) {
+    return serializers.deserializeWith(
+        Links.serializer, json.decode(jsonString));
+  }
+
+  static Serializer<Links> get serializer => _$linksSerializer;
+}