Bug 945215 - Map HZ-GB-2312 to the replacement encoding. r=emk.

--HG--
rename : dom/encoding/test/reftest/bug863728-1-ref.html => dom/encoding/test/reftest/bug945215-1-ref.html
rename : dom/encoding/test/reftest/bug863728-1.html => dom/encoding/test/reftest/bug945215-1.html
rename : dom/encoding/test/reftest/bug863728-2-ref.html => dom/encoding/test/reftest/bug945215-2-ref.html
rename : dom/encoding/test/reftest/bug863728-2.html => dom/encoding/test/reftest/bug945215-2.html
Bug 945215 addendum - Adjust Web Platform Test expectations for HZ-GB-2312. rs=Tomcat.