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This patch removes old logic of setting cache GUID for old clients which
had no this field. Clients must have set this field after one and a half
years. Clients that haven't migrated will remove sync metadata (treat as
cache guid mismatch) and go through download and merge procedure.

There is one more little change: ConnectIfReady is removed from
OnPendingDataLoaded because it does nothing and seems to be obsolete.

Bug: 947044
Change-Id: I72a441c5ed9bfa2d77a58494aaa2181a1df54d3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062277
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752072}