Giving compile errors on Clang/OSX.

http://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Mac%20Builder%20%28dbg%29/builds/30008

This reverts commit 7f67b030.

Change-Id: I5fb7d237c99ca9f2a8d50538f86dfc334d56ddd9
Reviewed-on: https://chromium-review.googlesource.com/263722Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>