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

pkg/analyzer/lib/src/generated/source_io.dart

Index: pkg/analyzer/lib/src/generated/source_io.dart
diff --git a/pkg/analyzer/lib/src/generated/source_io.dart b/pkg/analyzer/lib/src/generated/source_io.dart
index 7a90a2a595b7a1bea9b2333477b49927d820eda4..43dfb42947a6e0977e916b053dddcd9cda5b57b6 100644
--- a/pkg/analyzer/lib/src/generated/source_io.dart
+++ b/pkg/analyzer/lib/src/generated/source_io.dart
@@ -11,7 +11,6 @@ import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:path/path.dart' as path;
-import 'package:source_span/source_span.dart' as source_span;
 
 export 'package:analyzer/src/generated/source.dart';
 
@@ -147,8 +146,6 @@ class FileBasedSource extends Source {
    */
   static final Map<String, int> _idTable = new HashMap<String, int>();
 
-  source_span.SourceFile _sourceFile;
-
   /**
    * The URI from which this source was originally derived.
    */
@@ -238,10 +235,6 @@ class FileBasedSource extends Source {
   String get shortName => file.getName();
 
   @override
-  source_span.SourceFile get sourceFile => _sourceFile ??=
-      new source_span.SourceFile(file.readAsStringSync(), url: uri);
-
-  @override
   UriKind get uriKind {
     String scheme = uri.scheme;
     return UriKind.fromScheme(scheme);