function onResourceContent(error, content, contentEncoded)
        {
            this._content = error ? null : content;
            this._contentError = error;
            this._contentEncoded = contentEncoded;
            var callbacks = this._pendingContentCallbacks.slice();
            for (var i = 0; i < callbacks.length; ++i)
                callbacks[i](this._content);
            this._pendingContentCallbacks.length = 0;
            delete this._contentRequested;
        }
@param {?Protocol.Error} error
@param {string} content
@param {boolean} contentEncoded
@this {WebInspector.NetworkRequest}