Remove unnecessary sk_tool_utils::EncodeImageToData

This template is only used in practice for SkBitmaps. There is already a
public API that does the same thing, so there's no need for this one.

Change-Id: I20b10aa8bc87a56face947689e1f0eaf4c3cc4e8
Reviewed-on: https://skia-review.googlesource.com/156540
Reviewed-by: Hal Canary <halcanary@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
6 files changed