Revert "Drop the ref on the GrOpList's target in makeClosed"

This reverts commit dcd499caed823f23bc70c07df7804a6dc1306606.

Reason for revert: memory issue
Original change's description:
> Drop the ref on the GrOpList's target in makeClosed
> 
> Bug: 729233
> Change-Id: Ifb66b745e604d7f7c22c2907bcffa91d2086236d
> Reviewed-on: https://skia-review.googlesource.com/19495
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,robertphillips@google.com

Change-Id: I4269c696c57a93cdd056e7c3a887c35b8765ac6d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 729233
Reviewed-on: https://skia-review.googlesource.com/19793
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
5 files changed