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This fixes the fact that the wrong data was sent to the histogram
"Sync.Startup.PolicyLoadTimeout" and uses a new histogram named
"Sync.Startup.PolicyLoadTimeout2" to avoid using the wrong data.

Bug: 1129065
Change-Id: Iaa42e0ede6348f130a8e1e09ea35c2989aaff955
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629574
Commit-Queue: Yann Dago <ydago@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Auto-Submit: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844668}