Remove class FastUri from analyzer.

pkg/analyzer/lib/src/dart/analysis/file_state.dart

Index: pkg/analyzer/lib/src/dart/analysis/file_state.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/file_state.dart b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
index f92cc1cd155dac300eaf562465bed2bba12bd088..619a0350b48fe0d307c4d2003a48e2d1b197dc47 100644
--- a/pkg/analyzer/lib/src/dart/analysis/file_state.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
@@ -25,7 +25,6 @@ import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/name_filter.dart';
 import 'package:analyzer/src/summary/summarize_ast.dart';
-import 'package:analyzer/src/util/fast_uri.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 import 'package:meta/meta.dart';
@@ -492,7 +491,7 @@ class FileState {
    * Return the [FileState] for the given [relativeUri].
    */
   FileState _fileForRelativeUri(String relativeUri) {
-    Uri absoluteUri = resolveRelativeUri(uri, FastUri.parse(relativeUri));
+    Uri absoluteUri = resolveRelativeUri(uri, Uri.parse(relativeUri));
     return _fsState.getFileForUri(absoluteUri);
   }