Comment 9 for bug 991033

Comment on attachment 617270
Fix offline handling in _uploaderCallback

self doesn't seem to be used here either:

+ aOptions = this._overrideDefault(kDefaultReturnHeader, aOptions);
+ let self = this;

or

+ let subjectString = Cc["@mozilla.org/supports-string;1"]
+ .createInstance(Ci.nsISupportsString);
+ subjectString.data = aString;

but other than that and the previous comment, this looks OK. The failure to upload large files worries me, so we should figure that out.