Remove failure expectations for shader_random tests. Apparently the current clang roll has fixed these already. BUG=722345 Change-Id: I59f07f197fdfd1eb6e000390ee93d41938fe4d42 Reviewed-on: https://chromium-review.googlesource.com/510031 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>