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It was never accurate: It was recorded during most profile destructions,
even if Sync was never enabled in the first place. Since I'm not aware
of anything that depends on this number, let's just get rid of it rather
than replace it with something that works.

Bug: none
Change-Id: I397e499f559852188c731c04cbb748f98a69fe24
Reviewed-on: https://chromium-review.googlesource.com/1117068Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570785}