ccpr: Fix heap use-after-free caused by member destruction order

Bug: skia:7733
Change-Id: Ia210dded84a2ee9c24fa7ea7fd86226e573a2bc3
Reviewed-on: https://skia-review.googlesource.com/156721
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
3 files changed