Make NetworkEventDispatcher class final

(cherry picked from commit 4423217d24338963329c75907d84b0ee3eeea5b4)

Bug: 185153775
Test: m
Merged-In: I3edf4d8662da906dc001ea77adbf1cae438352e1
Change-Id: I0ef901d78672d186e3c9ccf86969f5354b5cbedc
4 files changed