Revert of Add SkRacy

Revert of Add SkRacy (https://codereview.chromium.org/371363004/)

Reason for revert:
hidden symbol 'AnnotateBenignRaceSized' in obj/base/third_party/dynamic_annotations/libdynamic_annotations.a(obj/base/third_party/dynamic_annotations/dynamic_annotations.dynamic_annotations.o) is referenced by DSO lib/libblink_platform.so

Original issue's description:
> Add SkRacy
> 
> SkRacy<T> is a zero-overhead wrapper for a T, except it also
> silences race warnings when TSAN is running.
> 
> Here we apply in several classes.  In SkMatrix and SkPathRef,
> we use it to opportunistically cache some idempotent work.
> 
> In SkPixelRef, we wrap the genIDs.  We think the worst that
> can happen here is we'll increment the global next-genID a
> few times instead of once when we go to get another ID.
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/d5e3e6ae1b3434ad1158f441902ff65f1eeaa3a7

TBR=reed@google.com,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/d3f3e5895efb5edfd838ba9127093c804f9dbc12

[mtklein, 2014-07-08 21:05:45]

Created Revert of Add SkRacy

[commit-bot: I haz the power, 2014-07-08 21:06:42]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@google.com/377693005/1

[commit-bot: I haz the power, 2014-07-08 21:06:52]

Change committed as d3f3e5895efb5edfd838ba9127093c804f9dbc12