Fix for <rdar://problem/6525392> REGRESSION (r40180): Scroll wheel events over text scroll the page
        instead of the ancestor overflow (23525)
        
        Make sure that we always call scroll() on the nearest enclosing RenderBox.  No test case is possible
        here, since wheel scrolling is currently untestable (the offset varies from machine to machine).

        Reviewed by Dan Bernstein

        * page/EventHandler.cpp:
        (WebCore::scrollAndAcceptEvent):
        (WebCore::EventHandler::scrollOverflow):
        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::enclosingBox):
        * rendering/RenderObject.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@40235 268f45cc-cd09-0410-ab3c-d52691b4dbfc