Revert "Add back legacy webkit options"

This reverts commit 3ff2584460ddd3dcd9f88532498d26211459726d.
Revert "Revert "Disable ION uncached buffers""

This reverts commit 7256ec5686f9b4c890cc30f8ab2e1eeff6c03d8e.
Completely remove classic webview prop
Enable NO_SECURE_DISCARD for recovery

 * To speed up formatting after we enabled MMC_CAP_ERASE in kernel
Adding setprop entries for tcp delayed ack for Wifi & LTE

TCP delayed ack settings are expected to be modified when the
Wifi or LTE connection is established and the configurations
will be reverted back when the Wifi connection is terminated.
The change also modifies the /sys/kernel/ipv4/tcp_delack_seg
and /sys/kernel/ipv4/tcp_use_useconfig file owner to "system"