Revert "Update disable-blink-features=LayoutNG"

This reverts commit c3d943c2.

Reason for revert: Broke Windows builders.

Bug: 1018587

Original change's description:
> Update disable-blink-features=LayoutNG
>
> * 3 crashes in native-file-system.
> * Mostly image rebaselines where scrollbar buttons became
>   grayed when the scroll position is at begin/end. Probably
>   someone fixed this.
> * A few pixel differences in rendering fonts, for vertical
>   flow and "AM" in the date picker.
>
> TBR=ikilpatrick@chromium.org
> NOTRY=true
>
> Change-Id: I1f8a9eb2fbb816f27bf2eb8d51e423919dbbf9a1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882249
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Koji Ishii <kojii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709765}

TBR=kojii@chromium.org,ikilpatrick@chromium.org
NOTRY=true

# Skipping CQ checks to get CQ in working state.

Change-Id: I4551c8420fa9d28ff322abe59b02f6d9fd6609f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879345
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709772}

third_party/blink/web_tests/FlagExpectations/disable-blink-features=LayoutNG

@@ -397,8 +397,3 @@ Bug(none) virtual/composite-after-paint/scrollingcoordinator/non-fast-scrollable
 Bug(none) virtual/forced-high-contrast-colors/fast/css/forced-colors-mode/forced-colors-mode-15.html [ Failure ]
 Bug(none) virtual/forced-high-contrast-colors/fast/css/forced-colors-mode/backplate/forced-colors-mode-backplate-07.html [ Failure ]
 
-# 10/27/2019 updates.
-Bug(none) external/wpt/css/css-writing-modes/wm-propagation-body-044.html [ Failure ]
-Bug(none) external/wpt/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.window.html [ Crash ]
-Bug(none) external/wpt/native-file-system/sandboxed_FileSystemBaseHandle-postMessage.tentative.https.window.html [ Crash ]
-Bug(none) external/wpt/native-file-system/sandboxed_FileSystemDirectoryHandle-getFile.tentative.https.any.html [ Crash ]