Bug 1039846 - Response implementation. r=baku

--HG--
extra : rebase_source : 0da394758a5ccf6c1fe87d1a51ed0c4c27d9350e
Bug 1039846 - Split Headers into InternalHeaders. r=baku

--HG--
extra : rebase_source : 1b7e0a27e44f1e11ed84de7be18a19155d6750d5
Bug 1071290 - Allow Blobs in Fetch BodyInit. r=baku

--HG--
extra : rebase_source : 412dffd78d5b0c4cddad58374bbe1dd051877c47