Revert "prevent getCarrierName from throwing error when there's no network"

This reverts commit 23281113d108f6671fed4ccbd2c9ff4fb7f40735.
Revert "[FXOS-249] Added new request stats (osVersion, deviceType, carrierName, screen w/h)"

This reverts commit 307d5ea70466f077095be2fa5f42caea1a969295.