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This preserves suppress Play Store show state in case Chrome was
restarted during the previous session and initial OptIn flow is
currently active.

TEST=Locally, simulating that case  + unit test
BUG=b:119069366

Change-Id: Ifc30bf538baf42d6b91a20d8263d90e7d8962db2
Reviewed-on: https://chromium-review.googlesource.com/c/1331829Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608208}