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

sdk/lib/internal/internal_sources.gypi

Index: sdk/lib/internal/internal_sources.gypi
diff --git a/sdk/lib/_collection_dev/collection_dev_sources.gypi b/sdk/lib/internal/internal_sources.gypi
similarity index 81%
rename from sdk/lib/_collection_dev/collection_dev_sources.gypi
rename to sdk/lib/internal/internal_sources.gypi
index bb2574270227947f0c710bd4d0f111254280db87..17cc2870396eb7db00d62129ba96b8099ed388f3 100644
--- a/sdk/lib/_collection_dev/collection_dev_sources.gypi
+++ b/sdk/lib/internal/internal_sources.gypi
@@ -2,10 +2,10 @@
 # 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:collection-dev library.
+# This file contains all sources for the dart:_internal library.
 {
   'sources': [
-    'collection_dev.dart',
+    'internal.dart',
     # The above file needs to be first as it lists the parts below.
     'iterable.dart',
     'list.dart',