Update mirror tests for removed API.

tests/lib/mirrors/metadata_test.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.
 
 library test.metadata_test;
 
 import 'dart:mirrors';
 
 const string = 'a metadata string';
 
@@ skipping 36 matching lines @@
   if (MirrorSystem.getName(symbol) != 'symbol') {
     // This happened in dart2js due to how early library metadata is
     // computed.
     throw 'Bad constant: $symbol';
   }
 
   MirrorSystem mirrors = currentMirrorSystem();
   ClassMirror myClassMirror = reflectClass(MyClass);
   checkMetadata(myClassMirror, [symbol, string]);
   LibraryMirror lib = mirrors.findLibrary(#test.metadata_test);
-  MethodMirror function = lib.functions[#main];
+  MethodMirror function = lib.declarations[#main];
   checkMetadata(function, [symbol, string, symbol]);
-  MethodMirror method = myClassMirror.methods[#myMethod];
+  MethodMirror method = myClassMirror.declarations[#myMethod];
   checkMetadata(method, [string, symbol, string]);
-  method = myClassMirror.methods[#myOtherMethod];
+  method = myClassMirror.declarations[#myOtherMethod];
   checkMetadata(method, []);
 
-  VariableMirror xMirror = myClassMirror.variables[#x];
+  VariableMirror xMirror = myClassMirror.declarations[#x];
   checkMetadata(xMirror, [hest, hest, symbol]);
 
-  VariableMirror yMirror = myClassMirror.variables[#y];
+  VariableMirror yMirror = myClassMirror.declarations[#y];
   checkMetadata(yMirror, []);
 
   // TODO(ahe): Test local functions.
 }