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Network time is frequently unavailable when we hit certificate date
errors. This CL histograms additional information about why network time
is unavailable (specifically, whether no time query has been made or
whether the system clock lost sync since the last time query).

To do so, I deprecated the old network time histogram that shared an
enum with the build time histogram, and introduced a new network
time histogram with a network time enum (rather than adding more
network-specific values to the enum that is shared with the build time
histogram).

BUG=

Review-Url: https://codereview.chromium.org/2254433003
Cr-Commit-Position: refs/heads/master@{#415244}