video.

Reviewed by Anders Carlsson.

Made other cleanup.

* WebView/WebVideoFullscreenHUDWindowController.h: Reverted the types of
_timeline and _volumeSlider to the more generic NSControl.
* WebView/WebVideoFullscreenHUDWindowController.mm:
(-[WebVideoFullscreenHUDWindowController scheduleTimeUpdate]): Cleaned
up style.
(-[WebVideoFullscreenHUDWindowController windowDidLoad]): Added an
assertion that the cast to NSButton * is legal. Removed casts.
(-[WebVideoFullscreenHUDWindowController updateTime]): Use
-setValue:forKey: instead of an NSSlider method.
(timeToString): Changed to support only non-negative values and
simplified.
(-[WebVideoFullscreenHUDWindowController remainingTimeText]): Always
prepend a “-” to the time.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@50426 268f45cc-cd09-0410-ab3c-d52691b4dbfc