Use fprintf(stderr) instead of std::cerr. This allows us to include <ostream> instead of <iostream> to avoid including a static initializer. BUG=angleproject:2037 Change-Id: Ib7e84a15018fa951bad1c87ffec4bfb0c896749f Reviewed-on: https://chromium-review.googlesource.com/507627 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>