ART: Replace ScopedFd with FdFile

FdFile can now be used like ScopedFd. Remove ScopedFd.

Bug: 21192156
Test: m test-art-host
Test: m test-art-target (shamu)
Change-Id: I32115fa8b2b8bb5aa5d1886eae63522f80ce836b
9 files changed