[LayoutNG] Rebaseline recent image failures

This patch rebaselines 1px differences in images that appear
recently, probably due to paint or composition changes, but
these changes look reasonable.

Reviewed test resluts of build 12392:
https://test-results.appspot.com/data/layout_results/linux_layout_tests_layout_ng/12392/webkit_layout_tests%20%28with%20patch%29/layout-test-results/results.html

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

Bug: 591099
Change-Id: I396deb04b6e1b1d46580594881837da738238fe9
Reviewed-on: https://chromium-review.googlesource.com/c/1361744
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613642}
12 files changed