Reformat createFolderNestedDownloads test case

Reformat to be consistent with the other create_new_folder test cases.

Bug: None, no change in behavior.
Change-Id: I1a3bf2d7fa923b42149630e0da34c5a46865e9a7
Reviewed-on: https://chromium-review.googlesource.com/c/1321650
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605906}

ui/file_manager/integration_tests/file_manager/create_new_folder.js

@@ -200,24 +200,18 @@ testcase.createFolderDownloads = function() {
 testcase.createFolderNestedDownloads = function() {
   let appId;
 
-  const promise =
-      new Promise(function(resolve) {
+  const promise = new Promise(function(resolve) {
     setupAndWaitUntilReady(
         null, RootPath.DOWNLOADS, resolve, BASIC_LOCAL_ENTRY_SET, []);
-      })
-          .then(function(results) {
+  }).then(function(results) {
     appId = results.windowId;
     return expandRoot(appId, TREEITEM_DOWNLOADS);
-          })
-          .then(function() {
+  }).then(function() {
     return remoteCall.navigateWithDirectoryTree(
         appId, '/photos', 'My files/Downloads');
-          })
-          .then(function() {
-            return remoteCall.waitForFiles(
-                appId, [], {ignoreLastModifiedTime: true});
-          })
-          .then(function() {
+  }).then(function() {
+    return remoteCall.waitForFiles(appId, [], {ignoreLastModifiedTime: true});
+  }).then(function() {
     return createNewFolder(appId, [], TREEITEM_DOWNLOADS);
   });