anchor.diff:    /// [Uri] or a [String].
     ///
     /// If [executable] is passed, it's used as the Chrome executable. Otherwise
  -  /// `"google-chrome"` will be looked up on the system PATH.
  +  /// the default executable name for the current OS will be used.
     Chrome(url, {String executable}) {
  -    if (executable == null) executable = "google-chrome";
  +    if (executable == null) executable = _defaultExecutable();
   
       // Don't return a Future here because there's no need for the caller to wait
       // for the process to actually start. They should just wait for the HTTP
  
positive.code:         "--disable-extensions",
          "--disable-popup-blocking",
          "--bwsi",
          "--no-first-run"
        ]).then((process) {
          _process = process;
          _onProcessStartedCompleter.complete();
  
negative.code:     // Swallow exceptions. The user should explicitly use [onExit] for these.
      return onExit.catchError((_) {});
    }
  
    /// Return the default executable for the current operating system.
    String _defaultExecutable() {
      if (Platform.isMacOS) {
        return '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';
      }
      if (!Platform.isWindows) return 'google-chrome';
  
      // Chrome could be installed in several places on Windows. The only way to
      // find it is to check.
      var prefixes = [
        Platform.environment['LOCALAPPDATA'],
        Platform.environment['PROGRAMFILES'],
        Platform.environment['PROGRAMFILES(X86)']
      ];
      var suffix = r'Google\Chrome\Application\chrome.exe';
  
      for (var prefix in prefixes) {
        if (prefix == null) continue;
  
        var path = p.join(prefix, suffix);
        if (new File(p.join(prefix, suffix)).existsSync()) return path;
      }
  
      // Fall back on looking it up on the path. This probably won't work, but at
      // least it will fail with a useful error message.
      return "chrome.exe";
    }
  }
  