[BGPT] Update FlagExpectations/enable-blink-gen-property-trees

TBR=pdr@chromium.org

Bug: 884239,884240
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iafece0358cf595c3055c481ac7af7368dde110f7
Reviewed-on: https://chromium-review.googlesource.com/1226354
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591413}
1 file changed