am 4b164c1b: Kill off the remaining GC-specific system properties.

Merge commit '4b164c1bf3592d4d83d93a5de58bb09676f1462c' into gingerbread-plus-aosp

* commit '4b164c1bf3592d4d83d93a5de58bb09676f1462c':
  Kill off the remaining GC-specific system properties.