Revert of make drawImage a virtual on SkDevice (patchset #3 id:40001 of https://coder...

Revert of make drawImage a virtual on SkDevice (patchset #3 id:40001 of https://codereview.chromium.org/1118823004/)

Reason for revert:
need to make serialization work for pictures, now that images are "real"

Original issue's description:
> make drawImage a virtual on SkDevice
>
> default impl will turn the Image into a (raster) bitmap and call drawBitmap.
>
> BUG=skia:3803
>
> Committed: https://skia.googlesource.com/skia/+/f603fb3d0e5fa57c3f228d66945bef198b001135

TBR=bsalomon@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:3803

Review URL: https://codereview.chromium.org/1122803002