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This switch will be used by telemetry so all chrome logging goes to
/var/log/chrome/chrome instead of split between this location and
/home/chronos/user/log/chrome, which is in the cryptohome, and sometimes
not collected by autotests.

BUG=chromium:724273
TEST=manual

Review-Url: https://codereview.chromium.org/2893313003
Cr-Commit-Position: refs/heads/master@{#476476}