Cronet 121.0.6167.71: delete aosp specific telemetry code

These are implemented in a more centralised version in
chromium. See b/311369704 for more details.

Bug: b/311369704, b/322154153
Change-Id: I75d3e1f21c86e6ae5fa66c6ac7789ea06f9e5cff
11 files changed