don't handle key events directly in CPScrollView

In stead CPScrollView will just pass the keyDown: event up the responder chain. If the event reaches the window, the window will send the correct action back to the first responder, if no responder before CPScrollView in the chain handles the event, CPScrollView will.

AppKit/CPScrollView.j

@@ -963,18 +963,13 @@
         [enclosingScrollView _respondToScrollWheelEventWithDeltaX:extraX deltaY:extraY];
 }
 
-- (void)keyDown:(CPEvent)anEvent
-{
-    [self interpretKeyEvents:[anEvent]];
-}
-
-- (void)pageUp:(id)sender
+- (void)scrollPageUp:(id)sender
 {
     var contentBounds = [_contentView bounds];
     [self moveByOffset:CGSizeMake(0.0, -(_CGRectGetHeight(contentBounds) - _verticalPageScroll))];
 }
 
-- (void)pageDown:(id)sender
+- (void)scrollPageDown:(id)sender
 {
     var contentBounds = [_contentView bounds];
     [self moveByOffset:CGSizeMake(0.0, _CGRectGetHeight(contentBounds) - _verticalPageScroll)];