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Changes:
Using system display api setDisplayProperties to turn on mirror mode is
deprecated. Replace the usage in display.js with the new api
setMirrorMode.

BUG=807825

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I86458ebf7aaa446d6ff23cde05c7eae819d11558
Reviewed-on: https://chromium-review.googlesource.com/896796
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534185}