Revert "Remove the emulator special case from the "adb root" code."

adb root doesn't work on the emulator, so this prevents root access
to a userdebug emulator.

Since the emulator has always been root even on userdebug builds, it
may be that adb root has never worked on the emulator.

Bug: 19974213

This reverts commit e8c72aa575b79a36d0477851febfd32294d63c4e.
1 file changed