Roll minimum picture version up to 44.

Roll minimum picture version up to 44.

This is the version produced by Chrome M54.  M56 is stable now.

I am most interested in deleting SkBitmapSourceDeserializer,
because it awkwardly calls from core into effects (SkImageSource).

Change-Id: I58b8b990017ba43372ab3333a4ef8312e75abc61
Reviewed-on: https://skia-review.googlesource.com/8286
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>