Remove previous blur image implementation. Try 2

The last version had a problem with the no simd compilation.

TBR=mtklein@google.com

Change-Id: I139388cf3bf1b55cb4a49133a98be129fd9711c6
Reviewed-on: https://skia-review.googlesource.com/80983
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
6 files changed