Revert "Add signed integer overflow checking to flac."

This reverts commit ab37b6247df0e8c4ec0ccaa870e667f62c74975b.

Bug: 11458679
Change-Id: Idac3bd854ebe826008c4059f117e96f67e4cb69a
Merge tag 'android-4.4.3_r1.1' into HEAD

Android 4.4.3 release 1.1