Update charted to 0.4.8 and roll

packages/which/lib/src/is_executable.dart

Index: packages/which/lib/src/is_executable.dart
diff --git a/packages/which/lib/src/is_executable.dart b/packages/which/lib/src/is_executable.dart
deleted file mode 100755
index 02fb83421ce1c0fa17cb05ea78d411eec56c5101..0000000000000000000000000000000000000000
--- a/packages/which/lib/src/is_executable.dart
+++ /dev/null
@@ -1,33 +0,0 @@
-
-library which.src.is_executable;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:when/when.dart';
-
-import 'has_permission.dart';
-
-Future<bool> isExecutable(String path, bool isWindows, Future<FileStat> getStat(path)) =>
-    _isExecutable(path, isWindows, getStat);
-
-bool isExecutableSync(String path, bool isWindows, FileStat getStat(path)) =>
-    _isExecutable(path, isWindows, getStat);
-
-_isExecutable(String path, bool isWindows, getStat(path)) =>
-    when(() => getStat(path), onSuccess: (stat) => isExecutableStat(stat, isWindows));
-
-/// Tests whether the file exists and is executable.
-bool isExecutableStat(FileStat stat, bool isWindows) {
-  if (FileSystemEntityType.FILE != stat.type) return false;
-
-  // There is no concept of executable on windows.
-  if (isWindows) return true;
-
-  // TODO: This currently produces false positives (returns true when it
-  //       shouldn't) when the uid/gid of current user and executable don't
-  //       match.  Fix if/when uid/gid support is added:
-  //       http://dartbug.com/22037.
-  return FilePermissionRole.values.any((role) =>
-      hasPermission(stat.mode, FilePermission.EXECUTE, role: role));
-}