Reviewed by Darin Fisher.

        https://bugs.webkit.org/show_bug.cgi?id=24407
        Windows scroll amount was too small, and wheel scroll distance
        conversion code was overly complex.

        * page/EventHandler.cpp:
        (WebCore::scrollAndAcceptEvent):
        * platform/PlatformWheelEvent.h:
        (WebCore::):
        * platform/ScrollView.cpp:
        (WebCore::ScrollView::wheelEvent):
        * platform/Scrollbar.h:
        * platform/gtk/WheelEventGtk.cpp:
        (WebCore::PlatformWheelEvent::PlatformWheelEvent):
        * platform/mac/WheelEventMac.mm:
        (WebCore::PlatformWheelEvent::PlatformWheelEvent):
        * platform/qt/WheelEventQt.cpp:
        * platform/win/WheelEventWin.cpp:
        (WebCore::horizontalScrollChars):
        (WebCore::verticalScrollLines):
        (WebCore::PlatformWheelEvent::PlatformWheelEvent):
        * platform/wx/MouseWheelEventWx.cpp:
        (WebCore::PlatformWheelEvent::PlatformWheelEvent):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41495 268f45cc-cd09-0410-ab3c-d52691b4dbfc