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This patch cleans up the expectations file for blink-gen-property-trees
and starts running more tests.

Bug: 836886
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: I7a6252bfa6a1fa5fb3ca8f5c4cc6d01ad7eec8e5
Reviewed-on: https://chromium-review.googlesource.com/1196906Reviewed-by: Tien-Ren Chen <trchen@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587853}