[infra] Translate _sources.gypi files to _sources.gni files

sdk/lib/internal/internal_sources.gypi

Index: sdk/lib/internal/internal_sources.gypi
diff --git a/sdk/lib/internal/internal_sources.gypi b/sdk/lib/internal/internal_sources.gypi
deleted file mode 100644
index f655856fef331aed621288c4b6a0e98f55f9fc6b..0000000000000000000000000000000000000000
--- a/sdk/lib/internal/internal_sources.gypi
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-# This file contains all sources for the dart:_internal library.
-{
-  'sources': [
-    'internal.dart',
-    # The above file needs to be first as it lists the parts below.
-    'iterable.dart',
-    'list.dart',
-    'linked_list.dart',
-    'print.dart',
-    'sort.dart',
-    'symbol.dart',
-  ],
-}