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Move all app command id enums to app_menu_constants.h.

Bug: 853927
Change-Id: Ib269c5b35dfad205912a4d69eb84d84fd7c86857
Reviewed-on: https://chromium-review.googlesource.com/1107199Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569643}