clean ups in SkPixelRef
- isLazyGenerated no longer needed
- requestLock does not need a virtual

Bug: skia:4328
Change-Id: I56ab5ee1e10f2a20332eb58464a2a48b487101e6
Reviewed-on: https://skia-review.googlesource.com/13195
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed