Revert of Memory improvements to render_pdfs; better DM pool size defaults (https://codereview.chromium.org/433063002/)

Reason for revert:
breaking android tests

Original issue's description:
> Memory improvements to render_pdfs; better DM pool size defaults
>
> Make SK_DEFAULT_GLOBAL_DISCARDABLE_MEMORY_POOL_SIZE equal to
> skia_resource_cache_mb_limit, if that value is >0 (true for some
> low-memory Android devices).
>
> render_pdfs test program uses lazy decoding (and the discardable
> memory pool).
>
> BUG=skia:2743
>
> Committed: https://skia.googlesource.com/skia/+/66058b614d9c8cb63c24b1c779dd1a9a80752217

R=djsollen@google.com, mtklein@google.com
TBR=djsollen@google.com, mtklein@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2743

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/418173012
4 files changed