Revert "Rename internal library dart:_collection-dev to dart:_internal."

runtime/lib/collection_dev_sources.gypi

Index: runtime/lib/collection_dev_sources.gypi
diff --git a/runtime/lib/collection_dev_sources.gypi b/runtime/lib/collection_dev_sources.gypi
deleted file mode 100644
index 63c909fcfc76430df9a984ee536cc6828d3481e4..0000000000000000000000000000000000000000
--- a/runtime/lib/collection_dev_sources.gypi
+++ /dev/null
@@ -1,14 +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:_collection-dev".
-
-{
-  'sources': [
-    'collection_dev_patch.dart',
-    # The above file needs to be first as it imports required libraries.
-    'print_patch.dart',
-    'symbol_patch.dart',
-  ],
-}