Move js library back into compiler directory.

sdk/lib/_internal/lib/mirrors_patch.dart

Index: sdk/lib/_internal/lib/mirrors_patch.dart
diff --git a/sdk/lib/_internal/lib/mirrors_patch.dart b/sdk/lib/_internal/lib/mirrors_patch.dart
deleted file mode 100644
index 758b1647a6b7893e56999662b6539089c7431597..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/lib/mirrors_patch.dart
+++ /dev/null
@@ -1,45 +0,0 @@
-// 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.
-
-// Patch library for dart:mirrors.
-
-import 'dart:_js_helper' show patch;
-import 'dart:_js_mirrors' as js;
-
-@patch
-class MirrorSystem {
-  @patch
-  static String getName(Symbol symbol) => js.getName(symbol);
-
-  @patch
-  static Symbol getSymbol(String name, [LibraryMirror library]) {
-    return js.getSymbol(name, library);
-  }
-}
-
-@patch
-MirrorSystem currentMirrorSystem() => js.currentJsMirrorSystem;
-
-@patch
-InstanceMirror reflect(Object reflectee) => js.reflect(reflectee);
-
-@patch
-ClassMirror reflectClass(Type key) {
-  if (key is! Type || key == dynamic) {
-    throw new ArgumentError('$key does not denote a class');
-  }
-  TypeMirror tm = reflectType(key);
-  if (tm is! ClassMirror) {
-    throw new ArgumentError("$key does not denote a class");
-  }
-  return (tm as ClassMirror).originalDeclaration;
-}
-
-@patch
-TypeMirror reflectType(Type key) {
-  if (key == dynamic) {
-    return currentMirrorSystem().dynamicType;
-  }
-  return js.reflectType(key);
-}