Remove Futures class, move methods to Future.

utils/pub/command_lish.dart

Index: utils/pub/command_lish.dart
diff --git a/utils/pub/command_lish.dart b/utils/pub/command_lish.dart
index 71adb9723d63aaea20431b38f8bdc1b59ca6c08f..e57402ccad90b3ffb464ca6f5ac5d4f49f4b4091 100644
--- a/utils/pub/command_lish.dart
+++ b/utils/pub/command_lish.dart
@@ -117,7 +117,7 @@ class LishCommand extends PubCommand {
   Future<List<String>> get _filesToPublish {
     var rootDir = entrypoint.root.dir;
 
-    return Futures.wait([
+    return Future.wait([
       dirExists(join(rootDir, '.git')),
       git.isInstalled
     ]).then((results) {
@@ -129,7 +129,7 @@ class LishCommand extends PubCommand {
       }
 
       return listDir(rootDir, recursive: true).then((entries) {
-        return Futures.wait(entries.mappedBy((entry) {
+        return Future.wait(entries.mappedBy((entry) {
           return fileExists(entry).then((isFile) {
             // Skip directories.
             if (!isFile) return null;