Move generated files to gen/.

test/codegen/expect/map_keys.js

Index: test/codegen/expect/map_keys.js
diff --git a/test/codegen/expect/map_keys.js b/test/codegen/expect/map_keys.js
deleted file mode 100644
index bef0e31aff15c6fff0b59cece5026036a87588f7..0000000000000000000000000000000000000000
--- a/test/codegen/expect/map_keys.js
+++ /dev/null
@@ -1,23 +0,0 @@
-dart_library.library('map_keys', null, /* Imports */[
-  'dart_sdk'
-], function(exports, dart_sdk) {
-  'use strict';
-  const core = dart_sdk.core;
-  const math = dart_sdk.math;
-  const dart = dart_sdk.dart;
-  const dartx = dart_sdk.dartx;
-  const map_keys = Object.create(null);
-  map_keys.main = function() {
-    core.print(dart.map({'1': 2, '3': 4, '5': 6}));
-    core.print(dart.map([1, 2, 3, 4, 5, 6]));
-    core.print(dart.map({'1': 2, [`${dart.notNull(math.Random.new().nextInt(2)) + 2}`]: 4, '5': 6}));
-    let x = '3';
-    core.print(dart.map(['1', 2, x, 4, '5', 6]));
-    core.print(dart.map(['1', 2, null, 4, '5', 6]));
-  };
-  dart.fn(map_keys.main);
-  // Exports:
-  exports.map_keys = map_keys;
-});
-
-//# sourceMappingURL=map_keys.js.map