Update ruby-selenium-webdriver to 2.45.0.

2.45.0 (2014-02-28)
===================

Firefox:
  * Native events in Firefox relied on an API that Mozilla no longer
    provides. As such, fall back to synthesized events on recent Firefox
    versions.

Ruby changes:
  * Allow switching windows when current window is closed (thanks Titus Fortner).
  * Add :javascript_enabled to Android capabilities.

2.44.0 (2014-10-05)
===================

No Ruby changes in this release.

Firefox:
  * Native event support for Firefox 24, 31, 32 and 33

2.43.0 (2014-09-09)
===================

* Make sure UnhandledAlertErrors includes the alert text if provided by the driver.
* Firefox
  - Make sure the browser process is properly killed if silent startup hangs (#7392)
  - native events support for Firefox 24, 31 and 32
* Loosen websocket dependency to ~> 1.0
* Add support for `switch_to.parent_frame` (thanks abotalov)
* Fix download location for Selenium::Server.{latest,get} (#7049 - thanks marekj)

(taca)