Lay waste to ClosureMirror.findInContext.

sdk/lib/mirrors/mirrors.dart

 // 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.
 
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
 //   var myField;
 //
@@ skipping 500 matching lines @@
    * If the invocation returns a result *r*, this method returns
    * the result of calling [reflect](*r*).
    * If the invocation causes a compilation error
    * the effect is the same as if a non-reflective compilation error
    * had been encountered.
    * If the invocation throws an exception *e* (that it does not catch)
    * this method throws *e*.
    */
   InstanceMirror apply(List positionalArguments,
                        [Map<Symbol, dynamic> namedArguments]);
-
-  /**
-   * Not yet supported. Calling this method throws an [UnsupportedError].
-   */
-  InstanceMirror findInContext(Symbol name, {ifAbsent: null});
 }
 
 /**
  * A [LibraryMirror] reflects a Dart language library, providing
  * access to the variables, functions, and classes of the
  * library.
  */
 abstract class LibraryMirror implements DeclarationMirror, ObjectMirror {
   /**
    * The absolute uri of the library.
@@ skipping 683 matching lines @@
    *
    * When used as metadata on an import of "dart:mirrors", this metadata does
    * not apply to the library in which the annotation is used, but instead
    * applies to the other libraries (all libraries if "*" is used).
    */
   final override;
 
   const MirrorsUsed(
       {this.symbols, this.targets, this.metaTargets, this.override});
 }