Due to (mostly ideological) licensing incompatibilities some package maintainers and/or distributions link software with GnuTLS instead op OpenSSL. GnuTLS provides a basic compatibility layer with OpenSSL.
So Chromium may in fact be programmed against OpenSSL but might work when linked to GnuTLS
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On Debian Chromium 33.0.1750.152-1 seems to be using GnuTLS, I didn't know that the official Chrome used NSS:
In fact on Debian most client software is using either NSS or GnuTLS, OpenSSL is more popular server-side of course.Due to (mostly ideological) licensing incompatibilities some package maintainers and/or distributions link software with GnuTLS instead op OpenSSL. GnuTLS provides a basic compatibility layer with OpenSSL.
So Chromium may in fact be programmed against OpenSSL but might work when linked to GnuTLS