Replace uses of FileBasedSource in cli

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 67 matching lines @@
       return path;
     }
     return "$path${JavaFile.separator}";
   }
 }
 
 /**
  * Instances of the class [ExplicitSourceResolver] map URIs to files on disk
  * using a fixed mapping provided at construction time.
  */
+@deprecated
 class ExplicitSourceResolver extends UriResolver {
   final Map<Uri, JavaFile> uriToFileMap;
   final Map<String, Uri> pathToUriMap;
 
   /**
    * Construct an [ExplicitSourceResolver] based on the given [uriToFileMap].
    */
   ExplicitSourceResolver(Map<Uri, JavaFile> uriToFileMap)
       : uriToFileMap = uriToFileMap,
         pathToUriMap = _computePathToUriMap(uriToFileMap);
@@ skipping 468 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;
 }