Drop gitignore entry for now obsolete test262 archive

BUG=none
R=jkummerow@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/300453003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21455 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

.gitignore

@@ -59,7 +59,6 @@ shell_g
 /test/test262/data
 /test/test262/data.old
 /test/test262/tc39-test262-*
-/test/test262/test262-*
 /third_party
 /tools/jsfunfuzz
 /tools/jsfunfuzz.zip