Do not use std::strlen. GCC doesn't use the std:: namespace for these methods. BUG=angle:773 Change-Id: I0d887f103298cdd184b3f7825c5e44363edb9b92 Reviewed-on: https://chromium-review.googlesource.com/232697 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org>