Revert of Use std::unique_ptr. (patchset #7 id:120001 of https://codereview.chromium.org/1780933003/ )

Reason for revert:
Now we remember!  The problem was Clank:

https://build.chromium.org/p/tryserver.chromium.android/builders/android_clang_dbg_recipe/builds/34329

Original issue's description:
> Use std::unique_ptr.
>
> TBR=reed@google.com
>
> Committed: https://skia.googlesource.com/skia/+/20c1e3abfc681771f73eb19fde7284196e028940

TBR=bungeman@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1782973002
17 files changed