Remove histogram Net.Cronet.PrefsInitTime.

Change-Id: I0d03deb5ec5eda34e2e64778e3721d26e8cb5c8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577867
Commit-Queue: Eric Roman <eroman@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653321}
2 files changed