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Network Quality Estimator (NQE) encapsulates int32_t as a
base::Optional<int32_t> at some of the places. This happens
on-the-fly. This is confusing, and may also be the
cause of some of the crashes.

Change-Id: I66142aa5047d9da577d60e17b3186c37b0c9a149
Bug: 887162
Reviewed-on: https://chromium-review.googlesource.com/1237730Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593251}