Use AbsolutePathContext in Folder.contains().

pkg/analyzer/test/file_system/physical_resource_provider_test.dart

Index: pkg/analyzer/test/file_system/physical_resource_provider_test.dart
diff --git a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
index 87d976abccf34ce6f83026c14d319e6d14f61cb1..852c7b2cf7d106c2407afb2bfb13fa5fb8962dd8 100644
--- a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
+++ b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
@@ -301,7 +301,7 @@ class PhysicalResourceProviderTest extends _BaseTest {
           // See https://github.com/dart-lang/sdk/issues/23762
           // Not sure why this breaks under Windows, but testing to see whether
           // we are running Windows causes the type to change. For now we print
-          // the type out of curriosity.
+          // the type out of curiosity.
           print(
               'PhysicalResourceProviderTest:test_watchFile_delete received an event with type = ${changesReceived[0].type}');
         } else {
@@ -378,8 +378,8 @@ class PhysicalResourceProviderTest extends _BaseTest {
   }
 
   test_watchFolder_modifyFile_inSubDir() {
-    var subdirPath = join(tempPath, 'foo');
-    new io.Directory(subdirPath).createSync();
+    var fooPath = join(tempPath, 'foo');
+    new io.Directory(fooPath).createSync();
     var path = join(tempPath, 'bar');
     var file = new io.File(path);
     file.writeAsStringSync('contents 1');
@@ -410,7 +410,7 @@ class PhysicalResourceProviderTest extends _BaseTest {
       File file = PhysicalResourceProvider.INSTANCE.getResource(path);
       var changesReceived = <WatchEvent>[];
       var subscription = file.changes.listen(changesReceived.add);
-      // Delay running the rest of the test to allow file.changes propogate.
+      // Delay running the rest of the test to allow file.changes propagate.
       return _delayed(() => test(changesReceived)).whenComplete(() {
         subscription.cancel();
       });