Deprecate DirectoryBasedDartSdk and transition existing uses to the new API

pkg/analyzer_cli/lib/src/incremental_analyzer.dart

Index: pkg/analyzer_cli/lib/src/incremental_analyzer.dart
diff --git a/pkg/analyzer_cli/lib/src/incremental_analyzer.dart b/pkg/analyzer_cli/lib/src/incremental_analyzer.dart
index d57327a6b1e20b5e22af050aa3556e243040699d..d7e9084171ec713257b985d19e78e8409582c206 100644
--- a/pkg/analyzer_cli/lib/src/incremental_analyzer.dart
+++ b/pkg/analyzer_cli/lib/src/incremental_analyzer.dart
@@ -10,10 +10,10 @@ import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
+import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/sdk.dart';
-import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/incremental_cache.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
@@ -35,7 +35,7 @@ IncrementalAnalysisSession configureIncrementalAnalysis(
   // If supported implementations, configure for incremental analysis.
   if (cachePath != null &&
       context is InternalAnalysisContext &&
-      sdk is DirectoryBasedDartSdk) {
+      sdk is FolderBasedDartSdk) {
     context.typeProvider = sdk.context.typeProvider;
     // Set the result provide from the cache.
     CacheStorage storage = new FolderCacheStorage(