function _removeDocFromCache(evt, document) {
        if (_cachedValues.hasOwnProperty(document.file.fullPath)) {
            delete _cachedValues[document.file.fullPath];
            document.off(".htmlInstrumentation");
        }
    }
@private
Removes the cached information (DOM, timestamp, etc.) used by HTMLInstrumentation
for the given document.
@param {$.Event} event (unused)
@param {Document} document The document to clear from the cache.