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

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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