Reapply "Remove @deprecated features."

sdk/lib/io/file_impl.dart

Index: sdk/lib/io/file_impl.dart
diff --git a/sdk/lib/io/file_impl.dart b/sdk/lib/io/file_impl.dart
index 71dca70cef7204961ecce61f26c8437a4542c4f9..8f26576592de207c58d34e1bddde915fc3e1e63f 100644
--- a/sdk/lib/io/file_impl.dart
+++ b/sdk/lib/io/file_impl.dart
@@ -308,8 +308,6 @@ class _File extends FileSystemEntity implements File {
     return new File(newPath);
   }
 
-  Directory get directory => super.parent;
-
   Future<RandomAccessFile> open({FileMode mode: FileMode.READ}) {
     if (mode != FileMode.READ &&
         mode != FileMode.WRITE &&
@@ -388,10 +386,6 @@ class _File extends FileSystemEntity implements File {
     return new _RandomAccessFile(id, "");
   }
 
-  Future<String> fullPath() => resolveSymbolicLinks();
-
-  String fullPathSync() => resolveSymbolicLinksSync();
-
   Stream<List<int>> openRead([int start, int end]) {
     return new _FileStream(path, start, end);
   }