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This patch removes UpdateLayers::BuildPropertyTrees trace events when in
layer lists mode which is used by blink gen property trees and slimming
paint v2. This patch also cleans up LayerTreeHost::DoUpdateLayers by
removing the unused in_update_property_trees_ variable.

Bug: 836886

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-gen-property-trees;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I35e6bd7c59b0384d8c2c62a1d3bdb1eed152353b
Reviewed-on: https://chromium-review.googlesource.com/1176357Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583448}