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Currently a server time string is parsed by base::Time::FromString
in announcement notification system. When not specify the time zone,
then Chrome uses local time zone.

We should use base::Time::FromUTCString that assumes UTC time when
there is no time zone in the server time string.

Bug: 1048437
Change-Id: Iba84f557fdcea19a5635f00c2f7ebc3c41279d7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037013Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740402}