Provide direction to users of the now deprecated class FileUriResolver

pkg/analyzer/tool/task_dependency_graph/generate.dart

 // Copyright (c) 2015, 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.
 
 /**
  * This file contains code to output a description of tasks and their
  * dependencies in ".dot" format.  Prior to running, the user should run "pub
  * get" in the analyzer directory to ensure that a "packages" folder exists.
  *
  * TODO(paulberry):
@@ skipping 144 matching lines @@
     String packageRootPath;
     if (Platform.packageRoot != null) {
       packageRootPath = Uri.parse(Platform.packageRoot).toFilePath();
     } else {
       packageRootPath = path.join(rootDir, 'packages');
     }
     JavaFile packagesDir = new JavaFile(packageRootPath);
     List<UriResolver> uriResolvers = [
       new DartUriResolver(sdk),
       new PackageUriResolver(<JavaFile>[packagesDir]),
-      new FileUriResolver()
+      new ResourceUriResolver(PhysicalResourceProvider.INSTANCE)
     ];
     context.sourceFactory = new SourceFactory(uriResolvers);
     Source dartDartSource =
         setupSource(path.join('lib', 'src', 'task', 'dart.dart'));
     Source taskSource = setupSource(path.join('lib', 'plugin', 'task.dart'));
     Source modelSource = setupSource(path.join('lib', 'task', 'model.dart'));
     Source enginePluginSource =
         setupSource(path.join('lib', 'src', 'plugin', 'engine_plugin.dart'));
     CompilationUnitElement modelElement = getUnit(modelSource).element;
     InterfaceType analysisTaskType = modelElement.getType('AnalysisTask').type;
@@ skipping 173 matching lines @@
   @override
   visitIdentifier(Identifier node) {
     Element element = node.staticElement;
     if (element is PropertyAccessorElement &&
         element.isGetter &&
         element.returnType.isSubtypeOf(type)) {
       callback(element);
     }
   }
 }