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

runtime/lib/developer_sources.gypi

Index: runtime/lib/developer_sources.gypi
diff --git a/runtime/lib/developer_sources.gypi b/runtime/lib/developer_sources.gypi
deleted file mode 100644
index 896f2e1ab5f4ba26ea5feb4158b5d7616c9be3ae..0000000000000000000000000000000000000000
--- a/runtime/lib/developer_sources.gypi
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright (c) 2015, 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 visible via dart:developer library.
-
-{
-  'sources': [
-    'developer.cc',
-    # developer.dart needs to be the first dart file because it contains
-    # imports.
-    'developer.dart',
-    'profiler.cc',
-    'profiler.dart',
-    'timeline.cc',
-    'timeline.dart',
-  ],
-}
-