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Due to flash removal in M88, remove |force_use_property_tree_builder_| and related logic.

Bug: 925855
Change-Id: Ia9826e35ea3c3e70fb235fba916aeeeed7d95ed6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449840Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: jongdeok.kim <jongdeok.kim@navercorp.com>
Cr-Commit-Position: refs/heads/master@{#815003}