Revert "Remove Registry from registerMetadataConstant" and "Serialize metadata"

pkg/compiler/lib/src/elements/modelx.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 elements.modelx;
 
 import '../common.dart';
 import '../common/resolution.dart' show Resolution, ParsingContext;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_constructors.dart';
@@ skipping 3175 matching lines @@
    */
   ConstantExpression constant;
   Element annotatedElement;
   int resolutionState;
 
   /**
    * The beginning token of this annotation, or [:null:] if it is synthetic.
    */
   Token get beginToken;
 
-  Token get endToken;
-
   MetadataAnnotationX([this.resolutionState = STATE_NOT_STARTED]);
 
   MetadataAnnotation ensureResolved(Resolution resolution) {
     if (annotatedElement.isClass || annotatedElement.isTypedef) {
       TypeDeclarationElement typeDeclaration = annotatedElement;
       typeDeclaration.ensureResolved(resolution);
     }
     if (resolutionState == STATE_NOT_STARTED) {
       resolution.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   Node parseNode(ParsingContext parsing);
 
-  SourceSpan get sourcePosition {
-    Uri uri = annotatedElement.compilationUnit.script.resourceUri;
-    return new SourceSpan.fromTokens(uri, beginToken, endToken);
-  }
-
   String toString() => 'MetadataAnnotation($constant, $resolutionState)';
 }
 
 /// Metadata annotation on a parameter.
 class ParameterMetadataAnnotation extends MetadataAnnotationX {
   final Metadata metadata;
 
   ParameterMetadataAnnotation(Metadata this.metadata);
 
   Node parseNode(ParsingContext parsing) => metadata.expression;
@@ skipping 65 matching lines @@
       body = node.asFunctionExpression().body;
     }
     return new ParsedResolvedAst(
         declaration,
         node,
         body,
         definingElement.treeElements,
         definingElement.compilationUnit.script.resourceUri);
   }
 }