Reviewed by Darin Adler.

        Small cleanup in WebView.
        - Move global data initialization to WebView's initialization method.
        - Move _clearViewUpdateRunLoopObserver from WebViewPrivate to WebView (FileInternal)

        * WebView/WebView.mm:
        (-[WebViewPrivate init]): Remove global initializers.
        (-[WebViewPrivate dealloc]): Cleanup whitespace.
        (-[WebViewPrivate finalize]): Ditto.
        (-[WebView _close]): Call [self _clearViewUpdateRunLoopObserver] instead of
        [_private _clearViewUpdateRunLoopObserver]
        (+[WebView initialize]): Move global initializers here.
        (-[WebView _clearViewUpdateRunLoopObserver]): Moved from WebViewPrivate.
        (viewUpdateRunLoopObserverCallBack): Call [self _clearViewUpdateRunLoopObserver]
        instead of [_private _clearViewUpdateRunLoopObserver]



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@44406 268f45cc-cd09-0410-ab3c-d52691b4dbfc