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This is necessary because these flags need to be accessed from within
//ash and //chromeos, which do not have access to chrome_features.h
since it resides in //chrome.

Bug: 824568, 752273
Change-Id: I2d20f244bc88758825dd37edf5b9956336017563
Reviewed-on: https://chromium-review.googlesource.com/1029228
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554459}