The new HTML parser uses chardet directly and makes nsICharsetDetectionAdaptor. Remove nsICharsetDetectionAdaptor as dead code once the old parser is gone.
Created attachment 530619 [details] [diff] [review] Remove nsICharsetDetectionAdaptor from the tree
nsHTMLContentSink is used for about:blank only these days, so this can land.
https://hg.mozilla.org/integration/mozilla-inbound/rev/6e755023cdfa Not adding an extension compat keyword, because extensions using this interface would have been broken since Firefox 4 anyway.