Make source mirror ObjectMirror.getField synchronous

sdk/lib/_internal/compiler/implementation/mirrors/mirrors.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 mirrors;
 
 import 'dart:async';
 import 'dart:uri';
 
-// TODO(rnystrom): Use "package:" URL (#4968).
-import 'dart2js_mirror.dart';
-
 /**
  * The main interface for the whole mirror system.
  */
 abstract class MirrorSystem {
   /**
    * Returns an unmodifiable map of all libraries in this mirror system.
    */
   Map<Uri, LibraryMirror> get libraries;
 
   /**
@@ skipping 95 matching lines @@
    */
   List<InstanceMirror> get metadata;
 }
 
 abstract class ObjectMirror implements Mirror {
   /**
    * Invokes a getter and returns a mirror on the result. The getter
    * can be the implicit getter for a field or a user-defined getter
    * method.
    */
-  Future<InstanceMirror> getField(String fieldName);
+  InstanceMirror getField(String fieldName);
 }
 
 /**
  * An [InstanceMirror] reflects an instance of a Dart language object.
  */
 abstract class InstanceMirror implements ObjectMirror {
   /**
    * A mirror on the type of the reflectee.
    */
   ClassMirror get type;
@@ skipping 20 matching lines @@
    * If you access [reflectee] when [hasReflectee] is false, an
    * exception is thrown.
    */
   get reflectee;
 }
 
 /**
  * Specialized [InstanceMirror] used for reflection on constant lists.
  */
 abstract class ListInstanceMirror implements InstanceMirror {
-  Future<InstanceMirror> operator[](int index);
+  /**
+   * Returns an instance mirror of the value at [index] or throws a [RangeError]
+   * if the [index] is out of bounds.
+   */
+  InstanceMirror operator[](int index);
+
+  /**
+   * The number of elements in the list.
+   */
   int get length;
 }
 
 /**
  * Specialized [InstanceMirror] used for reflection on constant maps.
  */
 abstract class MapInstanceMirror implements InstanceMirror {
   /**
    * Returns a collection containing all the keys in the map.
    */
   Iterable<String> get keys;
 
   /**
-   * Returns a future on the instance mirror of the value for the given key or
+   * Returns an instance mirror of the value for the given key or
    * null if key is not in the map.
    */
-  Future<InstanceMirror> operator[](String key);
+  InstanceMirror operator[](String key);
 
   /**
    * The number of {key, value} pairs in the map.
    */
   int get length;
 }
 
 /**
  * Specialized [InstanceMirror] used for reflection on type constants.
  */
@@ skipping 502 matching lines @@
   /**
    * Returns the URI where the source originated.
    */
   Uri get sourceUri;
 
   /**
    * Returns the text of this source.
    */
   String get sourceText;
 }