SkBitmap::fPixelRefOrigin removed

Motivation: makes SkBitmap 8 bytes smaller.

fPixelRefOrigin is rarely used, and can be recaluated when needed.

Also, remove two of SkBitmap's private methods and fold in their
functions.

Change-Id: I2cddb9e4b5480404bf6da3edfb0155ab82cf47d2
Reviewed-on: https://skia-review.googlesource.com/91300
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2 files changed