ZygoteInit: more dead code cleanup

ZYGOTE_FORK_MODE has been set to false since 2009, and the
code indicates that runForkMode() was "retained for reference only."
Remove this dead code. There will always be a reference to this code
in git.

Change-Id: Iddfdca8379fdc6521febea81e553de763b6f4fd0
1 file changed