Revert of DM::SKPSrc::size() reports correct size. (patchset #1 id:1 of https://coder...

Revert of DM::SKPSrc::size() reports correct size. (patchset #1 id:1 of https://codereview.chromium.org/863243005/)

Reason for revert:
OOM on 32-bit machines.

Original issue's description:
> DM::SKPSrc::size() reports correct size.
>
> Also, DM::GPUSink and DM::RasterSink crop DM::Src::size() to 2048x2048.
>
> Motivation:
>   Improve PDF testing by printing the entire SKP.
>
> Source: http://crrev.com/863243004
>
> BUG=skia:3365
>
> Committed: https://skia.googlesource.com/skia/+/441b10eac09a1f44983e35da827a6b438a409e63

TBR=halcanary@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:3365

Review URL: https://codereview.chromium.org/884743003