Update SOURCE_KIND when a missing source file appears

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 476 matching lines @@
       JavaFile.pathContext.toUri(filePath).toString();
 
   /**
    * Return `true` if the given URI is a `package` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `package` URI
    */
   static bool isPackageUri(Uri uri) => PACKAGE_SCHEME == uri.scheme;
 }
-
-/**
- * Instances of the class `RelativeFileUriResolver` resolve `file` URI's.
- */
-class RelativeFileUriResolver extends UriResolver {

[Brian Wilkerson, 2016/02/26 15:07:32]

Removing this class is technically a breaking change. Please restore it and mark
it as being @deprecated if it should be removed as part of the next set of
breaking changes.

-  /**
-   * The name of the `file` scheme.
-   */
-  static String FILE_SCHEME = "file";
-
-  /**
-   * The directories for the relatvie URI's
-   */
-  final List<JavaFile> _relativeDirectories;
-
-  /**
-   * The root directory for all the source trees
-   */
-  final JavaFile _rootDirectory;
-
-  /**
-   * Initialize a newly created resolver to resolve `file` URI's relative to the given root
-   * directory.
-   */
-  RelativeFileUriResolver(this._rootDirectory, this._relativeDirectories)
-      : super();
-
-  @override
-  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
-    String rootPath = _rootDirectory.toURI().path;
-    String uriPath = uri.path;
-    if (uriPath != null && uriPath.startsWith(rootPath)) {
-      String filePath = uri.path.substring(rootPath.length);
-      for (JavaFile dir in _relativeDirectories) {
-        JavaFile file = new JavaFile.relative(dir, filePath);
-        if (file.exists()) {
-          return new FileBasedSource(file, actualUri != null ? actualUri : uri);
-        }
-      }
-    }
-    return null;
-  }
-
-  /**
-   * 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;
-}