Revert "ccpr: Unregister path listeners when their cache entries are evicted"

This reverts commit f30e49310fb8927d1acbfd39f6bdc5513aa7daa1.

Reason for revert: Slow down on skps across multiple bots and configs

Original change's description:
> ccpr: Unregister path listeners when their cache entries are evicted
> 
> Bug: skia:8452
> Change-Id: I5cf63c07481db38fc37e920e04ca140bad8966e4
> Reviewed-on: https://skia-review.googlesource.com/c/163560
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

TBR=bsalomon@google.com,brianosman@google.com,csmartdalton@google.com

Change-Id: I1f9859a02d9c78e4a83e68c6b26fd8d3badd2d8e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8452
Reviewed-on: https://skia-review.googlesource.com/c/163787
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
3 files changed