Revert of Force SkPath::getConvexity() cache for thread safety.

Revert of Force SkPath::getConvexity() cache for thread safety. (patchset #1 id:1 of https://codereview.chromium.org/2300003003/ )

Reason for revert:
I don't see anything else in the roll that could have caused the diff.

Original issue's description:
> Force SkPath::getConvexity() cache for thread safety.
> 
> I happened to stumble on this in a run of TSAN:
>     https://luci-milo.appspot.com/swarming/task/30fffe9497dc6310/steps/dm/0/stdout
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300003003
> 
> Committed: https://skia.googlesource.com/skia/+/d0634eeb565d706df2e148a33f137c6edf42bf2e

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

Committed: https://skia.googlesource.com/skia/+/df0e3ece70762fd4674e09e457e5accb4265995d

[mtklein, 2016-09-02 13:51:48]

The CQ bit was checked by mtklein@google.com

[mtklein, 2016-09-02 13:51:49]

Created Revert of Force SkPath::getConvexity() cache for thread safety.

[commit-bot: I haz the power, 2016-09-02 13:51:53]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-02 13:51:58]

Description was changed from

==========
Revert of Force SkPath::getConvexity() cache for thread safety. (patchset #1
id:1 of https://codereview.chromium.org/2300003003/ )

Reason for revert:
I don't see anything else in the roll that could have caused the diff.

Original issue's description:
> Force SkPath::getConvexity() cache for thread safety.
> 
> I happened to stumble on this in a run of TSAN:
>    
https://luci-milo.appspot.com/swarming/task/30fffe9497dc6310/steps/dm/0/stdout
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300003003
> 
> Committed:
https://skia.googlesource.com/skia/+/d0634eeb565d706df2e148a33f137c6edf42bf2e

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

to

==========
Revert of Force SkPath::getConvexity() cache for thread safety. (patchset #1
id:1 of https://codereview.chromium.org/2300003003/ )

Reason for revert:
I don't see anything else in the roll that could have caused the diff.

Original issue's description:
> Force SkPath::getConvexity() cache for thread safety.
> 
> I happened to stumble on this in a run of TSAN:
>    
https://luci-milo.appspot.com/swarming/task/30fffe9497dc6310/steps/dm/0/stdout
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300003003
> 
> Committed:
https://skia.googlesource.com/skia/+/d0634eeb565d706df2e148a33f137c6edf42bf2e

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

Committed:
https://skia.googlesource.com/skia/+/df0e3ece70762fd4674e09e457e5accb4265995d
==========

[commit-bot: I haz the power, 2016-09-02 13:51:59]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/df0e3ece70762fd4674e09e457e5accb4265995d