[BlinkGenPropertyTrees] Remove flag-specific expectations

BlinkGenPropertyTrees (BGPT) has been enabled for tests for some time
(status="test" & status="experimental" in runtime_enabled_features.json5
both enable the setting for tests). This patch removes the flag-specific
expectations which are unused.

Bug: 836886
Change-Id: I02f58268f5738e6c242cfadba8dd72c8aed87d0c
Reviewed-on: https://chromium-review.googlesource.com/c/1405428
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622075}
94 files changed