Bug 966552 - Ensure that we pick the editor XBL window key handler for designMode documents no matter where the focus is; r=Neil
Bug 967163. Use nsIChannel instead of nsIHttpChannel to contentLength. r=seth

This will let us get the right length for blob uris and is just better.

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extra : rebase_source : 4d898ab29c5e1d146d7b543bd1afdc6f6815f28c