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

sdk/lib/_collection_dev/print.dart

Index: sdk/lib/_collection_dev/print.dart
diff --git a/sdk/lib/_collection_dev/print.dart b/sdk/lib/_collection_dev/print.dart
deleted file mode 100644
index 0c7182e0ad3d613eb0f2a3c0838a7d9b06080491..0000000000000000000000000000000000000000
--- a/sdk/lib/_collection_dev/print.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2013, 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.
-
-part of dart._collection.dev;
-
-/**
- * This function is set by the first allocation of a Zone.
- *
- * Once the function is set the core `print` function calls this closure instead
- * of [printToConsole].
- *
- * This decouples the core library from the async library.
- */
-Function printToZone = null;
-
-external void printToConsole(String line);