Remove InheritedChannel

Android never supported inheritedChannel functionality.
Due to recent changes, stdin/out may be an unix socket.
This was causing System#inheritedChannel to not return
null early and crash when it fails to get unix socket
address.

Test: libcore.java.lang.OldSystemTest
Bug: 30659051
Change-Id: I8bb61defdf6ae765a997fc12eaf6ed066296c0c6
4 files changed