Fix AndroidHttpClient leaking connection

Also remove a lot of unneeded final key words

Patch Set 2:
  Properly close associated streams (InputStream & FileOutputStream)

Patch Set 3:
  Don't change mode of other files

Change-Id: Ibea5c87bd84acb2d53815c54bba4b0ce42de48ae
Merge "Fix AndroidHttpClient leaking connection" into jb-mr1