Clean up drawable theming APIs

Removes APIs for themed creation of a drawable from a stream, since
that doesn't involve any inflation. Also cleans up tinting methods
left over from previous clean up.

BUG: 15089957
Change-Id: I2af7aa9a6d351ae61b33ee1216c674fae1bffe11
Signed-off-by: Alan Viverette <alanv@google.com>