Revert of Replace EncodeBitmap with an interface. (patchset #12 id:210001 of https://codereview.chromium.org/784643002/)

Reason for revert:
Failing serialization tasks in DM:

http://build.chromium.org/p/client.skia/builders/Test-Win8-ShuttleA-GTX660-x86-Debug/builds/352/steps/dm/logs/stdio

Original issue's description:
> Replace EncodeBitmap with an interface.
>
> Gives more flexibility to the caller to decide whether to use the
> encoded data returned by refEncodedData().
>
> Provides an implementation that supports the old version of
> SkPicture::serialize().
>
> TODO: Update Chrome, so we can remove SK_LEGACY_ENCODE_BITMAP entirely
>
> BUG=skia:3190
>
> Committed: https://skia.googlesource.com/skia/+/0c4aba6edb9900c597359dfa49d3ce4a41bc5dd1
>
> Committed: https://skia.googlesource.com/skia/+/02b217f80b01a7dda8493422e5257c36a9ce8464

TBR=reed@google.com,rmistry@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:3190

Review URL: https://codereview.chromium.org/783393004
12 files changed