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The histogram that counts token state transitions was not correctly
tracking the cases when Chrome fails to load a token for the primary
account. This CL adds this entry to the histogram. This should allow us
to understand to what extent Chrome fails to load tokens from disk.

Bug: NONE
Change-Id: I6237d5090984e0244a6203d60f2c319072b73555
Reviewed-on: https://chromium-review.googlesource.com/c/1278731
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599207}