InfoSink.h needs stdlib.h for abs(int) and free() in the global namespace.

ExpressionParser needs malloc.h, because bison needs malloc and free in
the global namespace, but "#include <cassert>" will put it only in the
std:: namespace on QNX.

BUG=500
R=geofflang@chromium.org, shannonwoods@chromium.org

Review URL: https://codereview.appspot.com/19330044