Move logic for calling mouseDidMoveOverElement into WebCore

Move logic for calling mouseDidMoveOverElement into WebCore

WebCore:

        Move logic for calling mouseDidMoveOverElement into WebCore

        Reviewed by Sam.

        * page/EventHandler.cpp:
        (WebCore::EventHandler::mouseMoved): Added. Calls Chrome::mouseDidMoveOverElement.
        (WebCore::EventHandler::handleMouseMoveEvent): Now takes an optional
        HitTestResult* parameter which is used to communicate to the caller the
        node the mouse is over.
        * page/EventHandler.h:
        * page/mac/EventHandlerMac.mm:
        (WebCore::EventHandler::mouseMoved): Changed to call the overloaded
        mouseMoved().
        (WebCore::EventHandler::passMouseMoveEventToSubframe): Pass hoveredNode
        through to the subframe so we can get the deepest node hovered, not
        just the node's parent frame.
        * page/win/EventHandlerWin.cpp:
        (WebCore::EventHandler::passMouseMoveEventToSubframe): Ditto.

WebKit:

        Removed call to mouseDidMoveOverElement now that WebCore handles it

        Reviewed by Sam.

        * WebView/WebHTMLView.mm:
        (-[WebHTMLView _updateMouseoverWithEvent:]):

WebKit/win:

        Removed call to mouseDidMoveOverElement now that WebCore handles it

        Reviewed by Sam.

        * WebView.cpp:
        (WebView::handleMouseEvent):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@23998 268f45cc-cd09-0410-ab3c-d52691b4dbfc