clients(lr): revert Lightrider timings applied to NetworkRequests

[exterkamp]

This reverts commit ca1731a, which may have, slightly, kinda, messed up some performance data. Or whatever, I mean you never know.

[codecov]

Codecov Report

Merging #8752 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #8752     +/-   ##
=========================================
- Coverage   91.06%   90.97%   -0.1%     
=========================================
  Files         285      285             
  Lines        9712     9701     -11     
=========================================
- Hits         8844     8825     -19     
- Misses        868      876      +8

Flag	Coverage Δ
#smoke	83.36% <ø> (+0.02%)	⬆️
#unit	89.2% <ø> (-0.03%)	⬇️

Impacted Files	Coverage Δ
lighthouse-core/lib/network-request.js	99.38% <ø> (-0.04%)	⬇️
lighthouse-core/gather/connections/connection.js	73.33% <0%> (-6.67%)	⬇️
lighthouse-core/audits/user-timings.js	96% <0%> (-4%)	⬇️
...house-core/computed/metrics/lantern-speed-index.js	97.14% <0%> (-2.86%)	⬇️
lighthouse-core/gather/gather-runner.js	98.91% <0%> (-1.09%)	⬇️
lighthouse-core/lib/network-recorder.js	98.62% <0%> (-0.69%)	⬇️

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[brendankenny]

sweet, LGTM