Re-name scrollbar painter types

Reviewed by Sam Weinig.

Source/JavaScriptCore: 

WTF_USE_WK_SCROLLBAR_PAINTER is now WTF_USE_SCROLLBAR_PAINTER since WK no longer 
applies.
* wtf/Platform.h:

Source/WebCore: 

Names changed to remove references to WebKitSystemInterface since the 
implementation is now in WebCore. And the type names changed to be more Objective-
Cish instead of C++ish
WTF_USE_WK_SCROLLBAR_PAINTER -> WTF_USE_SCROLLBAR_PAINTER
WKScrollbarPainterRef -> ScrollbarPainter
WKScrollbarPainterControllerRef -> ScrollbarPainterController

* platform/mac/NSScrollerImpDetails.h:
* platform/mac/ScrollAnimatorMac.h:
* platform/mac/ScrollAnimatorMac.mm:
(-[ScrollbarPartAnimation initWithScrollbarPainter:part:WebCore::scrollAnimator:WebCore::animateAlphaTo:duration:]):
(-[ScrollbarPainterDelegate setUpAnimation:scrollerPainter:part:WebCore::animateAlphaTo:duration:]):
(-[ScrollbarPainterDelegate scrollerImp:animateKnobAlphaTo:duration:]):
(-[ScrollbarPainterDelegate scrollerImp:animateTrackAlphaTo:duration:]):
(WebCore::ScrollAnimatorMac::ScrollAnimatorMac):
(WebCore::ScrollAnimatorMac::~ScrollAnimatorMac):
(WebCore::ScrollAnimatorMac::notifyPositionChanged):
(WebCore::ScrollAnimatorMac::contentAreaWillPaint):
(WebCore::ScrollAnimatorMac::mouseEnteredContentArea):
(WebCore::ScrollAnimatorMac::mouseExitedContentArea):
(WebCore::ScrollAnimatorMac::mouseMovedInContentArea):
(WebCore::ScrollAnimatorMac::willStartLiveResize):
(WebCore::ScrollAnimatorMac::contentsResized):
(WebCore::ScrollAnimatorMac::willEndLiveResize):
(WebCore::ScrollAnimatorMac::contentAreaDidShow):
(WebCore::ScrollAnimatorMac::contentAreaDidHide):
(WebCore::ScrollAnimatorMac::didBeginScrollGesture):
(WebCore::ScrollAnimatorMac::didEndScrollGesture):
(WebCore::ScrollAnimatorMac::didAddVerticalScrollbar):
(WebCore::ScrollAnimatorMac::willRemoveVerticalScrollbar):
(WebCore::ScrollAnimatorMac::didAddHorizontalScrollbar):
(WebCore::ScrollAnimatorMac::willRemoveHorizontalScrollbar):
(WebCore::ScrollAnimatorMac::cancelAnimations):
(WebCore::ScrollAnimatorMac::setIsActive):
(WebCore::ScrollAnimatorMac::updateScrollerStyle):
* platform/mac/ScrollViewMac.mm:
(WebCore::ScrollView::platformSetScrollbarOverlayStyle):
* platform/mac/ScrollbarThemeMac.h:
* platform/mac/ScrollbarThemeMac.mm:
(+[ScrollbarPrefsObserver appearancePrefsChanged:]):
(WebCore::updateArrowPlacement):
(WebCore::ScrollbarThemeMac::registerScrollbar):
(WebCore::ScrollbarThemeMac::setNewPainterForScrollbar):
(WebCore::ScrollbarThemeMac::painterForScrollbar):
(WebCore::ScrollbarThemeMac::scrollbarThickness):
(WebCore::ScrollbarThemeMac::usesOverlayScrollbars):
(WebCore::ScrollbarThemeMac::updateScrollbarOverlayStyle):
(WebCore::ScrollbarThemeMac::hasThumb):
(WebCore::ScrollbarThemeMac::minimumThumbLength):
(WebCore::ScrollbarThemeMac::updateEnabledState):
(WebCore::scrollbarPainterPaint):
(WebCore::ScrollbarThemeMac::paint):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@93445 268f45cc-cd09-0410-ab3c-d52691b4dbfc