Revert of Implement SkImageFilter::Cache with SkResourceCache.

Revert of Implement SkImageFilter::Cache with SkResourceCache. (patchset #8 id:140001 of https://codereview.chromium.org/1370323002/ )

Reason for revert:
Landed PS8 temporarily to trigger the perf bots.


Original issue's description:
> Implement SkImageFilter::Cache with SkResourceCache.
> 
> The single global cache now uses the global SkResourceCache,
> and any Create()ed cache uses a local SkResourceCache.
> 
> No real public API changes (and only deletes).
> 
> I don't see any pixel diffs on .skps or GMs.
> Don't see any significant perf difference on 8888 or gpu configs.
> DM peak memory usage did drop by about 113M, close to the 128M cache size.
> 
> BUG=skia:3662
> 
> Landing PS8 temporarily to trigger the perf bots.
> TBR=reed@google.com
> 
> Committed: https://skia.googlesource.com/skia/+/75135d8ae1aa12e8e6bfce63291e5e876a77546f

TBR=reed@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:3662
Committed: https://skia.googlesource.com/skia/+/242397a1c95e34e3e2e5e85c85c81090317115cb

[mtklein_C, 2015-09-29 19:16:48]

Created Revert of Implement SkImageFilter::Cache with SkResourceCache.

[commit-bot: I haz the power, 2015-09-29 19:16:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1381523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1381523002/1

[commit-bot: I haz the power, 2015-09-29 19:17:19]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/242397a1c95e34e3e2e5e85c85c81090317115cb