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

pkg/analyzer/lib/src/summary/package_bundle_reader.dart

Index: pkg/analyzer/lib/src/summary/package_bundle_reader.dart
diff --git a/pkg/analyzer/lib/src/summary/package_bundle_reader.dart b/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
index 4c6580b027b9ffd26aeb617098a5677c862c26f3..23645da1d89ae9620ec7da0ab37b2d135aaa4d67 100644
--- a/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
+++ b/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
@@ -21,7 +21,6 @@ import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:path/path.dart' as pathos;
-import 'package:source_span/source_span.dart' as source_span;
 
 /**
  * The [ResultProvider] that provides results from input package summaries.
@@ -106,10 +105,6 @@ class InSummarySource extends Source {
   String get shortName => pathos.basename(fullName);
 
   @override
-  source_span.SourceFile get sourceFile =>
-      throw new StateError('Tried to get location info for InSummarySource');
-
-  @override
   UriKind get uriKind => UriKind.PACKAGE_URI;
 
   @override