Revert "Annotate benign race on SkPath::fConvexity."

This reverts commit c51a3a4e3c81a1d4100d5d29d31bf3a02eda2a7c.

Reason for revert: had to revert this in the copy constructor.  Might as well revert here too for consistency.

Original change's description:
> Annotate benign race on SkPath::fConvexity.
> 
> We're tired of this making our TSAN bot flaky, and equally tired of trying to fix it.
> 
> BUG=skia:5776
> 
> CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Release-TSAN-Trybot
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4691
> 
> Change-Id: Ib6005282c514a6d785fd4fffe5387cbb1caccbe1
> Reviewed-on: https://skia-review.googlesource.com/4691
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Ben Wagner <bungeman@google.com>
> 

TBR=mtklein@chromium.org,bungeman@google.com,reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I906b1e017471d9e00fc58402136497459d881f72
Reviewed-on: https://skia-review.googlesource.com/4740
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
2 files changed