Use ResourceProvider instead of specialized setRealRoot/setFakeRoot.

pkg/analyzer2dart/bin/analyzer2dart.dart

Index: pkg/analyzer2dart/bin/analyzer2dart.dart
diff --git a/pkg/analyzer2dart/bin/analyzer2dart.dart b/pkg/analyzer2dart/bin/analyzer2dart.dart
index b016a7893f0d7accb004ac46bf2c8ef053148f5f..e5e6328c7067a4dcf718c782bb76e74015fa1eb5 100644
--- a/pkg/analyzer2dart/bin/analyzer2dart.dart
+++ b/pkg/analyzer2dart/bin/analyzer2dart.dart
@@ -5,6 +5,7 @@
 /** The entry point for the command-line version analyzer2dart. */
 library analyzer2dart.cmdline;
 
+import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/sdk.dart';
@@ -18,11 +19,12 @@ void main(List<String> args) {
   // TODO(paulberry): hacky
   String path = args[0];
 
+  PhysicalResourceProvider provider = PhysicalResourceProvider.INSTANCE;
   DartSdk sdk = DirectoryBasedDartSdk.defaultSdk;
-  Driver analyzer2Dart = new Driver(sdk);
+  Driver analyzer2Dart = new Driver(provider, sdk);
 
   // Tell the analysis server about the root
-  Source source = analyzer2Dart.setRealRoot(path);
+  Source source = analyzer2Dart.setRoot(path);
 
   // Get the library element associated with the source.
   FunctionElement entryPointElement = analyzer2Dart.resolveEntryPoint(source);