Convert resource providers to use FileSource

pkg/analyzer/lib/src/generated/source_io.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.source_io;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 203 matching lines @@
 
   @override
   String get fullName {
     if (_absolutePath == null) {
       _absolutePath = file.getAbsolutePath();
     }
     return _absolutePath;
   }
 
   @override
-  int get hashCode => id;
+  int get hashCode => uri.hashCode;
 
   @override
   bool get isInSystemLibrary => uri.scheme == DartUriResolver.DART_SCHEME;
 
   @override
   int get modificationStamp => file.lastModified();
 
   @override
   String get shortName => file.getName();
 
@@ skipping 331 matching lines @@
   }
 
   /**
    * Return `true` if the given URI is a `file` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `file` URI
    */
   static bool isFileUri(Uri uri) => uri.scheme == FILE_SCHEME;
 }