Revert "Remove 'Element.docRange'."

pkg/analyzer/lib/src/dart/element/handle.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.element_handle;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 322 matching lines @@
     }
     return _elementReference;
   }
 
   @override
   AnalysisContext get context => _resynthesizer.context;
 
   @override
   String get displayName => actualElement.displayName;
 
+  @deprecated
+  @override
+  SourceRange get docRange => actualElement.docRange;
+
   @override
   String get documentationComment => actualElement.documentationComment;
 
   @override
   Element get enclosingElement => actualElement.enclosingElement;
 
   @override
   int get hashCode => _location.hashCode;
 
   @override
@@ skipping 762 matching lines @@
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   DartType get type => actualElement.type;
 
   @override
   DartObject computeConstantValue() => actualElement.computeConstantValue();
 }