[auto] Update FlagExpectations for LayoutNG

Following bot results are included.
12523 12525 12526 12529 12532 12534 12551 12558 12562 12564
12566 12567 12570 12572 12575 12577 12578 12580 12582 12586
12589 12595 12598 12600

5 lines were removed and 3 lines were deflaked by consecutive
results since 12570.

TBR=eae@chromium.org, mstensho@chromium.org
NOTRY=true

Bug: 591099
Change-Id: I44bb98fb69c27bad4a647ee547376ca06a2ca4e2
Reviewed-on: https://chromium-review.googlesource.com/c/1369493
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616227}