[LayoutNG] flag-specific rebaselines for recent text failures

The following text failures:
  paint/invalidation/reflection/scroll-fixed-layer-with-reflection.html
  paint/invalidation/scroll/scroll-fixed-layer-with-transformed-parent-layer.html
  paint/invalidation/scroll/scroll-in-fixed-layer.html
  paint/invalidation/scroll/scroll-in-transformed-layer.html
  paint/invalidation/scroll/scroll-with-transformed-parent-layer.html
were added to FlagExpectations in the maintenance CL:1166930,
but they are improvements. Their invalidation images match,
and has one less object.

Reviewed the test result of build 8758.

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

Bug: 591099
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I7665a49b24ab94f6871722f9cd172743d662ba63
Reviewed-on: https://chromium-review.googlesource.com/1170443
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582063}
6 files changed