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When merging, if we're given specifics that correspond to the local
guid, we try to access specifics object for the local guid in
|all_data_|. The problem with this, is that there isn't always an entry
there if reconcile has not happened yet. This only happens when the
initial sync round trip finishes before metadata loads from disk, but
this race is happening to users, see the bug.

The fix could be to check that |all_data_| actually contains an entry
for the local guid, but it really doesn't matter. Local data completely
cleared when sync is disabled, so reconcile will always create a local
entry with a fresh time stamp around the time merge is called. There's
no reason to complicate the logic inside of merge for no real benefit,
so I've simply removed the set_last_updated_timestamp call.

BUG=668938

Review-Url: https://codereview.chromium.org/2536043002
Cr-Commit-Position: refs/heads/master@{#435011}