Change the Sprite portion of SkBlitter use SkArenaAlloc.

The semantics of createT and make are the same with respect to
dtors, so it just a simple replacement of calls.

TBR=reed@google.com

Change-Id: Ib7d071d214edb44ea5c5466ce81252e9374b6eb7
Reviewed-on: https://skia-review.googlesource.com/8301
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
7 files changed