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

sdk/lib/_internal/libraries.dart

 // Copyright (c) 2012, 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.
 
 library libraries;
 
 /**
  * A bit flag used by [LibraryInfo] indicating that a library is used by dart2js
  */
 const int DART2JS_PLATFORM = 1;
@@ skipping 112 matching lines @@
       category: "Client",
       maturity: Maturity.WEB_STABLE,
       dart2jsPath: "web_gl/dart2js/web_gl_dart2js.dart"),
 
   "web_sql": const LibraryInfo(
       "web_sql/dartium/web_sql_dartium.dart",
       category: "Client",
       maturity: Maturity.WEB_STABLE,
       dart2jsPath: "web_sql/dart2js/web_sql_dart2js.dart"),
 
-  "_collection-dev": const LibraryInfo(
-      "_collection_dev/collection_dev.dart",
+  "_internal": const LibraryInfo(
+      "internal/internal.dart",
       category: "Internal",
       documented: false,
       dart2jsPatchPath:
-          "_internal/lib/collection_dev_patch.dart"),
+          "_internal/lib/internal_patch.dart"),
 
   "_js_helper": const LibraryInfo(
       "_internal/lib/js_helper.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 
   "_interceptors": const LibraryInfo(
       "_internal/lib/interceptors.dart",
       category: "Internal",
@@ skipping 142 matching lines @@
     "The library is stable. API backwards-compatibility is guaranteed.\n"
     "However implementation details might change.");
 
   static const Maturity LOCKED = const Maturity(5, "Locked",
     "This library will not change except when serious bugs are encountered.");
 
   static const Maturity UNSPECIFIED = const Maturity(-1, "Unspecified",
     "The maturity for this library has not been specified.");
 }