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

runtime/lib/internal_sources.gypi

Index: runtime/lib/internal_sources.gypi
diff --git a/runtime/lib/internal_sources.gypi b/runtime/lib/internal_sources.gypi
deleted file mode 100644
index 08d9bb73132c833bba715d050464a8ad82adc7af..0000000000000000000000000000000000000000
--- a/runtime/lib/internal_sources.gypi
+++ /dev/null
@@ -1,16 +0,0 @@
-# Copyright (c) 2011, 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.
-
-# Sources that patch the library "dart:_internal".
-
-{
-  'sources': [
-    'internal_patch.dart',
-    # The above file needs to be first as it imports required libraries.
-    'class_id.dart',
-    'class_id.cc',
-    'print_patch.dart',
-    'symbol_patch.dart',
-  ],
-}