Removed StatisticsRecorder::Initialize and StatisticsRecorder::IsActive.

This is a simple code cleanup. These methods were already deprecated and empty.

[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I658a4a8370fc423f1afd60ca5e943a4c8b511417
Bug: 
Reviewed-on: https://chromium-review.googlesource.com/846651
Commit-Queue: François Degros <[email protected]>
Reviewed-by: Julia Tuttle <[email protected]>
Reviewed-by: Victor Costan <[email protected]>
Reviewed-by: Charlie Harrison <[email protected]>
Reviewed-by: Yaron Friedman <[email protected]>
Reviewed-by: agrieve <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Bartosz Fabianowski <[email protected]>
Reviewed-by: Sylvain Defresne <[email protected]>
Reviewed-by: Alexei Svitkine <[email protected]>
Reviewed-by: Luke Halliwell <[email protected]>
Reviewed-by: Mitsuru Oshima <[email protected]>
Cr-Commit-Position: refs/heads/master@{#527562}
49 files changed