Revert "Connect analyzer's AnalysisError object to front_end's CompilationError."

pkg/analyzer/lib/src/string_source.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 analyzer.src.string_source;
 
 import 'package:analyzer/src/generated/engine.dart' show TimestampedData;
 import 'package:analyzer/src/generated/source.dart';
-import 'package:source_span/source_span.dart' as source_span;
 
 /**
  * An implementation of [Source] that's based on an in-memory Dart string.
  */
 class StringSource extends Source {
   /**
    * The content of the source.
    */
   final String _contents;
 
-  source_span.SourceFile _sourceFile;
-
   @override
   final String fullName;
 
   @override
   final Uri uri;
 
   @override
   final int modificationStamp;
 
   StringSource(this._contents, String fullName)
@@ skipping 11 matching lines @@
   @override
   int get hashCode => _contents.hashCode ^ fullName.hashCode;
 
   @override
   bool get isInSystemLibrary => false;
 
   @override
   String get shortName => fullName;
 
   @override
-  source_span.SourceFile get sourceFile =>
-      _sourceFile ??= new source_span.SourceFile(_contents, url: uri);
-
-  @override
   UriKind get uriKind => UriKind.FILE_URI;
 
   /**
    * Return `true` if the given [object] is a string source that is equal to
    * this source.
    */
   @override
   bool operator ==(Object object) {
     return object is StringSource &&
         object._contents == _contents &&
         object.fullName == fullName;
   }
 
   @override
   bool exists() => true;
 
   @override
   String toString() => 'StringSource ($fullName)';
 }