lib/async/index.js
function _remove (outputFile, done) {
    if (this._exists(outputFile)) {
      if (done) {
        this.filesDone.push(outputFile);
      } else {
        this.filesNotDone.push(outputFile);
      }
      clearTimeout(this.files[outputFile].timer);
      delete this.files[outputFile];
    }
  }
function _remove (outputFile, done) {
    if (this._exists(outputFile)) {
      if (done) {
        this.filesDone.push(outputFile);
      } else {
        this.filesNotDone.push(outputFile);
      }
      clearTimeout(this.files[outputFile].timer);
      delete this.files[outputFile];
    }
  }
Remove a file from the files array if it's there.
Unprotected version.

@param {String} outputFile - The outputFile to remove.
@param {Boolean} done - If true, add to filesDone collection.