Don't turn on sync flush by default.

Sync flush can be dangerous if used incorrectly (overly frequently
flushes can result in bad compression rations), also flush() here
has slightly different semantics from usual stream flushes (in that
they rarely affect the contents of the streams themselves).

See related issue:
https://code.google.com/p/android/issues/detail?id=62589

Change-Id: I97389c5924f3c338913df39830f27aedbfc3c440
1 file changed