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This CL adjusts the logic in NQE to not return low HTTP RTT values
when the underlying RTT value is unreliable. This primarily happens on
Desktop non-POSIX platforms where Chrome does not have access to
RTT at TCP layer, and there are lot of hanging requests which
affect the estimation accuracy.

Change-Id: Ib31dd31bfc616289e7236be156e33491057da91a
Bug: 1101529
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445029Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832705}