remove dead code for STREAM_API

Bug: skia:
Change-Id: I5c5a65710af443c60a3d13fb309ce31309be7f74
Reviewed-on: https://skia-review.googlesource.com/49460
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
14 files changed