Rip out getProcessAgeMs.

A certain system crash has pointed to this at least 7.9M times, and it's
not important.

Bug: 173264759
Test: boot
Change-Id: Ice3dddee6d62c443d3fd88e1082e5af7a58b4255
Merged-In: Ice3dddee6d62c443d3fd88e1082e5af7a58b4255
1 file changed