Rename m_isFocused on the frame to m_isActive, since it isn't really

    Rename m_isFocused on the frame to m_isActive, since it isn't really
        about focus but is instead about whether or not the top-level window is
        active.

        Pull code that was incorrectly factored into Mac-only code out of FrameMac
        and back up into Frame.

        Reviewed by andersca

        * bridge/mac/FrameMac.h:
        * bridge/mac/FrameMac.mm:
        * page/Frame.cpp:
        (WebCore::Frame::setFocusNodeIfNeeded):
        (WebCore::Frame::isActive):
        (WebCore::Frame::setIsActive):
        * page/FramePrivate.h:
        (WebCore::FramePrivate::FramePrivate):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@14791 268f45cc-cd09-0410-ab3c-d52691b4dbfc