Bug 1017613 - Part 1 - Fetch Body and Request. r=baku

--HG--
extra : transplant_source : R%AF%84%A2%29W%B8%86%D2o%DB%D4G%B2%D8%87%25i%0D%BE
Bug 1017613 - Part 2 - Response IDL and stubs. r=baku

--HG--
extra : transplant_source : %AEc%0E%00%0D%92%AB.f%B5%EB%87%F7%C9%5DgX%93%AC%0A
Bug 1017613 - Part 3 - fetch() IDL and stubs. r=baku

--HG--
extra : transplant_source : %B3%0A%E7%17m%5C%A5%DF%F4%1A%90Z%CF%B7%E2Y%CA%1E%21w