Revert of Fix race condition in parallel font initialization. (https://codereview.chromium.org/355573006/)

Reason for revert:
canaries still slightly broken

Original issue's description:
> Fix race condition in parallel font initialization.
>
> Uses a mutex to guard construction of the singleton, which initialies
> the non-threadsafe libfontconfig.  Without this change, the parallel
> path ops test runner crashes 6/10 and hangs 2/10 on startup; with this
> change, 0/10 problems.
>
> BUG=skia:2693
> R=mtklein@google.com,bungeman@google.com
>
> Committed: https://skia.googlesource.com/skia/+/df022f5972ae6a2a1d96d15c50eca52cade3abd8
>
> Committed: https://skia.googlesource.com/skia/+/60b08a0adfe73f593af62c8d3f55958438360e1b

R=bungeman@google.com, reed@google.com, tomhudson@google.com, tomhudson@chromium.org
TBR=bungeman@google.com, reed@google.com, tomhudson@chromium.org, tomhudson@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2693

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/354133004
4 files changed