The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7cf59fe731788560f890ce965036302ddb6369cb

commit 7cf59fe731788560f890ce965036302ddb6369cb
Author: Rune Lillesveen <rune@opera.com>
Date: Wed Sep 27 18:12:41 2017

Properly await promises in inert-tests.

I did not find a way to await each forEach or map in inert-inlines, so
I fell back on a plain old for-loop.

Bug:  726218 , 769347
Change-Id: I196ff128ce95319b7ca297254745aec842ef6cff
Reviewed-on: https://chromium-review.googlesource.com/686814
Commit-Queue: Rune Lillesveen <rune@opera.com>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504733}
[modify] https://crrev.com/7cf59fe731788560f890ce965036302ddb6369cb/third_party/WebKit/LayoutTests/LeakExpectations
[modify] https://crrev.com/7cf59fe731788560f890ce965036302ddb6369cb/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/7cf59fe731788560f890ce965036302ddb6369cb/third_party/WebKit/LayoutTests/fast/dom/inert/inert-inlines.html
[modify] https://crrev.com/7cf59fe731788560f890ce965036302ddb6369cb/third_party/WebKit/LayoutTests/fast/dom/inert/inert-label-focus.html
[modify] https://crrev.com/7cf59fe731788560f890ce965036302ddb6369cb/third_party/WebKit/LayoutTests/fast/dom/inert/inert-node-is-uneditable.html