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changes:
Per crbug.com/740268, we get all launch review YES. Remove behind-flag
--ash-enable-persistent-window-bounds switch.

Bug: 805046
Test: device test
Change-Id: I33dfec4dd97e01c7ba159ab005cfd97cff51e215
Reviewed-on: https://chromium-review.googlesource.com/954067Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Qiang Xu <warx@google.com>
Cr-Commit-Position: refs/heads/master@{#542267}