No bug - Various crashtest manifest cleanups.
--HG--
rename : dom/base/crashtests/713417.html => dom/base/crashtests/713417-1.html
rename : dom/workers/test/1158031.html => dom/workers/test/crashtests/1158031.html
rename : dom/workers/test/779707.html => dom/workers/test/crashtests/779707.html
rename : dom/workers/test/943516.html => dom/workers/test/crashtests/943516.html
rename : dom/workers/test/crashtests.list => dom/workers/test/crashtests/crashtests.list
rename : layout/generic/crashtests/812879.html => layout/generic/crashtests/812879-1.html
rename : layout/generic/crashtests/first-letter-638937.html => layout/generic/crashtests/first-letter-638937-1.html
extra : rebase_source : b9274dc6870030ed62bcee35350d566160502869
