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

runtime/bin/vmservice/vmservice_sources.gypi

Index: runtime/bin/vmservice/vmservice_sources.gypi
diff --git a/runtime/bin/vmservice/vmservice_sources.gypi b/runtime/bin/vmservice/vmservice_sources.gypi
deleted file mode 100644
index a7d06cd741659cc49dd77bfdf598e764d3d5c69c..0000000000000000000000000000000000000000
--- a/runtime/bin/vmservice/vmservice_sources.gypi
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright (c) 2016, 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 Dart sources for the dart:io implementation of
-# the VM Service server.
-{
-  'sources': [
-    'loader.dart',
-    'server.dart',
-    'vmservice_io.dart',
-  ],
-}