remove __cplusplus guard

The file cannot be used as a C header anyway.

Change-Id: Ic33341fce894e48fb0a50b8c7a14c32b59dc9223
Reviewed-on: https://skia-review.googlesource.com/134321
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed